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<?xml version="1.0" ?>
<!DOCTYPE book PUBLIC "-//KDE//DTD DocBook XML V4.2-Based Variant V1.1//EN" "dtd/kdex.dtd" [
<!ENTITY % English "INCLUDE">
<!ENTITY % addindex "IGNORE">
]>
<book lang="&language;">
<bookinfo>
<title>The Regular Expression Editor Manual</title>
<authorgroup>
<author>
<firstname>Jesper K.</firstname>
<surname>Pedersen</surname>
<affiliation><address><email>[email protected]</email></address></affiliation>
</author>
</authorgroup>
<date>2001-07-03</date>
<releaseinfo>0.1</releaseinfo>
<legalnotice>&underFDL;</legalnotice>
<copyright>
<year>2001</year>
<holder>Jesper K. Pedersen</holder>
</copyright>
<abstract>
<para>This Handbook describes the Regular Expression Editor widget</para>
</abstract>
<keywordset>
<keyword>KDE</keyword>
<keyword>regular expression</keyword>
</keywordset>
</bookinfo>
<!-- ====================================================================== -->
<!-- Introduction -->
<!-- ====================================================================== -->
<chapter id="introduction">
<title>Introduction</title>
<para>
The regular expression editor is an editor for editing regular expression
in a graphical style (in contrast to the <acronym>ASCII</acronym> syntax). Traditionally
regular expressions have been typed in the <acronym>ASCII</acronym> syntax, which for example
looks like <literal>^.*kde\b</literal>. The major drawbacks of
this style are:
<itemizedlist>
<listitem><para>It is hard to understand for
non-programmers.</para></listitem>
<listitem><para>It requires that you <emphasis>escape</emphasis>
certain symbols (to match a star for example, you need to type
<literal>\*</literal>). </para></listitem>
<listitem><para>It requires that you remember rules for
<emphasis>precedence</emphasis> (What does <literal>x|y*</literal>
match? a single <literal>x</literal> or a number of
<literal>y</literal>, <emphasis>OR</emphasis> a number of
<literal>x</literal> and <literal>y</literal>'s mixed?)</para></listitem>
</itemizedlist>
</para>
<para>
The regular expression editor, on the other hand, lets you
<emphasis>draw</emphasis> your regular expression in an unambiguous
way. The editor solves at least item two and three above. It might not make
regular expressions available for the non-programmers, though only tests by
users can tell that. So, if are you a non programmer, who has gained the
power of regular expression from this editor, then please
<ulink url="mailto:[email protected]">let me know</ulink>.
</para>
</chapter>
<!-- ====================================================================== -->
<!-- What is a Regular Expression -->
<!-- ====================================================================== -->
<chapter id="whatIsARegExp">
<title>What is a Regular Expression</title>
<para>A regular expression is a way to specify
<emphasis>conditions</emphasis> to be fulfilled for a situation
in mind. Normally when you search in a text editor you specify
the text to search for <emphasis>literally</emphasis>, using a
regular expression, on the other hand, you tell what a given
match would look like. Examples of this include <emphasis>I'm
searching for the word KDE, but only at the beginning of the
line</emphasis>, or <emphasis>I'm searching for the word
<literal>the</literal>, but it must stand on its own</emphasis>,
or <emphasis>I'm searching for files starting with the word
<literal>test</literal>, followed by a number of digits, for
example <literal>test12</literal>, <literal>test107</literal>
and <literal>test007</literal></emphasis></para>
<para>You build regular expressions from smaller regular
expressions, just like you build large Lego toys from smaller
subparts. As in the Lego world, there are a number of basic
building blocks. In the following I will describe each of these
basic building blocks using a number of examples.</para>
<example>
<title>Searching for normal text.</title>
<para>If you just want to search for a given text, a then regular
expression is definitely not a good choice. The reason for this is that
regular expressions assign special meaning to some characters. This
includes the following characters: <literal>.*|$</literal>. Thus if you want to
search for the text <literal>kde.</literal> (i.e. the characters
<literal>kde</literal> followed by a period), then you would need to
specify this as <literal>kde\.</literal><footnote><para>The regular
expression editor solves this problem by taking care of escape rules for
you.</para></footnote> Writing <literal>\.</literal> rather than just
<literal>.</literal> is called <emphasis>escaping</emphasis>.
</para>
</example>
<example id="positionregexp">
<title>Matching URLs</title>
<para>When you select something looking like a URL in KDE, then the
program <command>klipper</command> will offer to start
<command>konqueror</command> with the selected URL.</para>
<para><command>Klipper</command> does this by matching the selection
against several different regular expressions, when one of the regular
expressions matches, the accommodating command will be offered.</para>
<para>The regular expression for URLs says (among other things), that the
selection must start with the text <literal>http://</literal>. This is
described using regular expressions by prefixing the text
<literal>http://</literal> with a hat (the <literal>^</literal>
character).</para>
<para>The above is an example of matching positions using regular
expressions. Similar, the position <emphasis>end-of-line</emphasis> can
be matched using the character <literal>$</literal> (i.e. a dollar
sign).</para>
</example>
<example id="boundaryregexp">
<title>Searching for the word <literal>the</literal>, but not
<emphasis>the</emphasis><literal>re</literal>,
<literal>brea</literal><emphasis>the</emphasis> or
<literal>ano</literal><emphasis>the</emphasis><literal>r</literal></title>
<para>Two extra position types can be matches in the above way,
namely <emphasis>the position at a word boundary</emphasis>, and
<emphasis>the position at a <emphasis>non</emphasis>-word
boundary</emphasis>. The positions are specified using the text
<literal>\b</literal> (for word-boundary) and <literal>\B</literal> (for
non-word boundary)<emphasis></emphasis></para>
<para>Thus, searching for the word <literal>the</literal> can be done
using the regular expression <literal>\bthe\b</literal>. This specifies
that we are searching for <literal>the</literal> with no letters on each
side of it (i.e. with a word boundary on each side)</para>
<para>The four position matching regular expressions are inserted in the
regular expression editor using <link linkend="positiontool">four
different positions tool</link></para>
</example>
<example id="altnregexp">
<title>Searching for either <literal>this</literal> or <literal>that</literal></title>
<para>Imagine that you want to run through your document searching for
either the word <literal>this</literal> or the word
<literal>that</literal>. With a normal search method you could do this in
two sweeps, the first time around, you would search for
<literal>this</literal>, and the second time around you would search for
<literal>that</literal>.</para>
<para>Using regular expression searches you would search for both in the
same sweep. You do this by searching for
<literal>this|that</literal>. I.e. separating the two words with a
vertical bar.<footnote><para>Note on each side of the vertical bar is a
regular expression, so this feature is not only for searching for two
different pieces of text, but for searching for two different regular
expressions.</para></footnote></para>
<para>In the regular expression editor you do not write the vertical bar
yourself, but instead select the <link linkend="altntool">alternative
tool</link>, and insert the smaller regular expressions above each other.</para>
</example>
<example id="repeatregexp">
<title>Matching anything</title>
<para>Regular expressions are often compared to wildcard matching in the
shell - that is the capability to specify a number of files using the
asterisk. You will most likely recognize wildcard matching from the
following examples:
<itemizedlist>
<listitem><para><literal>ls *.txt</literal> - here <literal>*.txt</literal> is
the shell wildcard matching every file ending with the
<literal>.txt</literal> extension.</para></listitem>
<listitem><para><literal>cat test??.res</literal> - matching every file starting with
<literal>test</literal> followed by two arbitrary characters, and finally
followed by the test <literal>.res</literal></para></listitem>
</itemizedlist>
</para>
<para>In the shell the asterisk matches any character any number of
times. In other words, the asterisk matches <emphasis>anything</emphasis>.
This is written like <literal>.*</literal> with regular expression
syntax. The dot matches any single character, i.e. just
<emphasis>one</emphasis> character, and the asterisk, says that the
regular expression prior to it should be matched any number of
times. Together this says any single character any number of
times.</para>
<para>This may seem overly complicated, but when you get the larger
picture you will see the power. Let me show you another basic regular
expression: <literal>a</literal>. The letter <literal>a</literal> on its
own is a regular expression that matches a single letter, namely the
letter <literal>a</literal>. If we combine this with the asterisk,
i.e. <literal>a*</literal>, then we have a regular expression matching
any number of a's.</para>
<para>We can combine several regular expression after each
other, for example <literal>ba(na)*</literal>.
<footnote><para><literal>(na)*</literal> just says that what is inside
the parenthesis is repeated any number of times.</para></footnote>
Imagine you had typed this regular expression into the search field in a
text editor, then you would have found the following words (among
others): <literal>ba</literal>, <literal>bana</literal>,
<literal>banana</literal>, <literal>bananananananana</literal>
</para>
<para>Given the information above, it hopefully isn't hard for you to write the
shell wildcard <literal>test??.res</literal> as a regular expression
Answer: <literal>test..\.res</literal>. The dot on its own is any
character. To match a single dot you must write
<literal>\.</literal><footnote><para>This is called escaping</para></footnote>. In
other word, the regular expression <literal>\.</literal> matches a dot,
while a dot on its own matches any character. </para>
<para>In the regular expression editor, a repeated regular expression is
created using the <link linkend="repeattool">repeat tool</link> </para>
</example>
<example id="lookaheadregexp">
<title>Replacing <literal>&</literal> with
<literal>&amp;</literal> in a HTML document</title> <para>In
HTML the special character <literal>&</literal> must be
written as <literal>&amp;</literal> - this is similar to
escaping in regular expressions.</para>
<para>Imagine that you have written an HTML document in a normal editor
(e.g. XEmacs or Kate), and you totally forgot about this rule. What you
would do when realized your mistake was to replace every occurrences of
<literal>&</literal> with <literal>&amp;</literal>.</para>
<para>This can easily be done using normal search and replace,
there is, however, one glitch. Imagine that you did remember
this rule - <emphasis>just a bit</emphasis> - and did it right
in some places. Replacing unconditionally would result in
<literal>&amp;</literal> being replaced with
<literal>&amp;amp;</literal></para>
<para>What you really want to say is that <literal>&</literal> should
only be replaced if it is <emphasis>not</emphasis> followed by the letters
<literal>amp;</literal>. You can do this using regular expressions using
<emphasis>positive lookahead</emphasis>. </para>
<para>The regular expression, which only matches an ampersand if it is
not followed by the letters <literal>amp;</literal> looks as follows:
<literal>&(?!amp;)</literal>. This is, of course, easier to read using
the regular expression editor, where you would use the
<link linkend="lookaheadtools">lookahead tools</link>.</para>
</example>
</chapter>
<!-- ====================================================================== -->
<!-- Using the Regular Expression Editor -->
<!-- ====================================================================== -->
<chapter id="theEditor">
<title>Using the Regular Expression Editor</title>
<para>
This chapter will tell you about how the regular expression editor works.
</para>
<!-- ====================================================================== -->
<!-- The organization of the screen -->
<!-- ====================================================================== -->
<sect1 id="screenorganization">
<title>The organization of the screen</title>
<mediaobject>
<imageobject><imagedata format="PNG" fileref="theEditor.png"/></imageobject>
</mediaobject>
<para>The most important part of the editor is of course the editing
area, this is the area where you draw your regular expression. This
area is the larger gray one in the middle.</para>
<para>Above the editing area you have two Toolbars, the first one
contains the <link linkend="editingtools">editing actions</link> -
much like drawing tools in a drawing program. The second Toolbar
contains the <emphasis>whats this</emphasis> button, and buttons
for undo and redo.</para>
<para>Below the editing area you find the regular expression
currently build, in the so called ascii syntax. The ascii syntax
is updated while you edit the regular expression in the graphical
editor. If you rather want to update the ascii syntax then please
do, the graphical editor is updated on the fly to reflect your
changes.</para>
<para>Finally to the left of the editor area you will find a number
of pre-built regular expressions. They serve two purposes: (1) When
you load the editor with a regular expression then this regular
expression is made <emphasis>nicer</emphasis> or more comprehensive
by replacing common regular expressions. In the screen dump above,
you can see how the ascii syntax ".*" have been replaced with a box
saying "anything". (2) When you insert regular expression you may
find building blocks for your own regular expression from the set of
pre build regular expressions. See the section on
<link linkend="userdefinedregexps">user defined regular
expressions</link> to learn how to save your own regular expressions.</para>
</sect1>
<!-- ====================================================================== -->
<!-- Editing Tools -->
<!-- ====================================================================== -->
<sect1 id="editingtools">
<title>Editing Tools</title>
<para>The text in this section expects that you have read the chapter
on <link linkend="whatIsARegExp">what a regular expression
is</link>, or have previous knowledge on this subject.</para>
<para>All the editing tools are located in the tool bar above
editing area. Each of them will be described in the following.</para>
<simplesect id="selecttool">
<title>Selection Tool</title>
<mediaobject>
<imageobject><imagedata format="PNG" fileref="select.png"/>
</imageobject></mediaobject>
<para> The selection tool is used to
mark elements for cut-and-paste and drag-and-drop. This is very
similar to a selection tool in any drawing program.</para>
</simplesect>
<simplesect id="texttool"><title>Text Tool</title>
<mediaobject>
<imageobject>
<imagedata format="PNG" fileref="text.png"/>
</imageobject></mediaobject>
<para><inlinemediaobject><imageobject>
<imagedata format="PNG" fileref="texttool.png"/>
</imageobject></inlinemediaobject></para>
<para>Using this tool you will insert normal text to match. The
text is matched literally, i.e. you do not have to worry about
escaping of special characters. In the example above the following
regular expression will be build: <literal>abc\*\\\)</literal></para>
</simplesect>
<simplesect id="characterstool"><title>Character Tool</title>
<mediaobject><imageobject>
<imagedata format="PNG" fileref="characters.png"/>
</imageobject></mediaobject>
<para><inlinemediaobject><imageobject>
<imagedata format="PNG" fileref="charactertool.png"/>
</imageobject></inlinemediaobject></para>
<para> Using this tool you insert
character ranges. Examples includes what in ASCII text says
<literal>[0-9]</literal>, <literal>[^a-zA-Z,_]</literal>. When
inserting an item with this tool a dialog will appear, in which
you specify the character ranges.</para>
<para>See description of <link linkend="repeatregexp">repeated
regular expressions</link>.</para>
</simplesect>
<simplesect id="anychartool"><title>Any Character Tool</title>
<mediaobject><imageobject>
<imagedata format="PNG" fileref="anychar.png"/>
</imageobject></mediaobject>
<para><inlinemediaobject><imageobject><imagedata format="PNG" fileref="anychartool.png"/>
</imageobject></inlinemediaobject></para>
<para>This is the regular expression "dot" (.). It matches any
single character.</para>
</simplesect>
<simplesect id="repeattool"><title>Repeat Tool</title>
<mediaobject><imageobject>
<imagedata format="PNG" fileref="repeat.png"/>
</imageobject></mediaobject>
<para><inlinemediaobject><imageobject>
<imagedata format="PNG" fileref="repeattool.png"/>
</imageobject></inlinemediaobject></para>
<para>This is the repeated
elements. This includes what in ASCII syntax is represented
using an asterix (*), a plus (+), a question mark (?), and
ranges ({3,5}). When you insert an item using this tool, a
dialog will appear asking for the number of times to
repeat.</para>
<para>You specify what to repeat by drawing the repeated content
inside the box which this tool inserts.</para>
<para>Repeated elements can both be built from the outside in and
the inside
out. That is you can first draw what to be repeated, select it
and use the repeat tool to repeat it. Alternatively you can
first insert the repeat element, and draw what is to be repeated
inside it.</para>
<para>See description on the <link linkend="repeatregexp">repeated
regular expressions</link>.</para>
</simplesect>
<simplesect id="altntool"><title>Alternative Tool</title>
<mediaobject><imageobject>
<imagedata format="PNG" fileref="altn.png"/>
</imageobject></mediaobject>
<para><inlinemediaobject><imageobject><imagedata format="PNG" fileref="altntool.png"/>
</imageobject></inlinemediaobject></para>
<para>This is the alternative regular expression (|). You specify
the alternatives by drawing each alternative on top of each other
inside the box that this tool inserts.</para>
<para>See description on <link linkend="altnregexp">alternative
regular expressions</link></para>
</simplesect>
<simplesect id="compoundtool"><title>Compound Tool</title>
<mediaobject><imageobject>
<imagedata format="PNG" fileref="compound.png"/>
</imageobject></mediaobject>
<para><inlinemediaobject><imageobject><imagedata format="PNG" fileref="compoundtool.png"/>
</imageobject></inlinemediaobject></para>
<para>The compound tool does not represent any regular
expressions. It is used to group other sub parts together in a
box, which easily can be collapsed to only its title. This can be
seen in the right part of the screen dump above.</para>
</simplesect>
<simplesect id="positiontool"><title>Line Start/End Tools</title>
<mediaobject><imageobject>
<imagedata format="PNG" fileref="begline.png"/>
</imageobject></mediaobject>
<mediaobject><imageobject>
<imagedata format="PNG" fileref="endline.png"/>
</imageobject></mediaobject>
<para><inlinemediaobject><imageobject><imagedata format="PNG" fileref="linestartendtool.png"/>
</imageobject></inlinemediaobject></para>
<para>The line start and line end tools matches the start of the
line, and the end of the line respectively. The regular
expression in the screen dump above thus matches lines only
matches spaces.</para>
<para>See description of <link linkend="positionregexp">position
regular expressions</link>.</para>
</simplesect>
<simplesect><title>Word (Non)Boundary Tools</title>
<mediaobject><imageobject>
<imagedata format="PNG" fileref="wordboundary.png"/>
</imageobject></mediaobject>
<mediaobject><imageobject><imagedata format="PNG" fileref="nonwordboundary.png"/>
</imageobject></mediaobject>
<para><inlinemediaobject><imageobject><imagedata format="PNG" fileref="boundarytools.png"/>
</imageobject></inlinemediaobject></para>
<para>The boundary tools matches a word boundary respectively a
non-word boundary. The regular expression in the screen dump thus
matches any words starting with <literal>the</literal>. The word
<literal>the</literal> itself is, however, not matched.</para>
<para>See description of <link linkend="boundaryregexp">boundary
regular expressions</link>.</para>
</simplesect>
<simplesect id="lookaheadtools"><title>Positive/Negative Lookahead
Tools</title>
<mediaobject><imageobject> <imagedata format="PNG" fileref="poslookahead.png"/>
</imageobject></mediaobject>
<mediaobject><imageobject> <imagedata format="PNG" fileref="neglookahead.png"/>
</imageobject></mediaobject>
<para><inlinemediaobject><imageobject> <imagedata format="PNG" fileref="lookaheadtools.png"/>
</imageobject></inlinemediaobject></para>
<para>The look ahead tools either specify a positive or negative
regular expression to match. The match is, however, not part of
the total match.</para>
<para>Note: You are only allowed to place lookaheads at the end
of the regular expressions. The Regular Expression Editor widget
does not enforce this.</para>
<para>See description of <link linkend="lookaheadregexp">look ahead
regular expressions</link>.</para>
</simplesect>
</sect1>
<!-- ====================================================================== -->
<!-- User Defined Regular Expressions -->
<!-- ====================================================================== -->
<sect1 id="userdefinedregexps">
<title>User Defined Regular Expressions</title>
<para>Located at the left of the editing area is a list box
containing user defined regular expressions. Some regular
expressions are pre-installed with your KDE installation, while
others you can save yourself.</para>
<para>These regular expression serves two purposes
(<link linkend="screenorganization">see detailed
description</link>), namely (1) to offer you a set of building
block and (2) to make common regular expressions prettier.</para>
<para>You can save your own regular expressions by right clicking the
mouse button in the editing area, and choosing <literal>Save Regular
Expression</literal>.</para>
<para>If the regular expression you save is within a
<link linkend="compoundtool">compound container</link> then the
regular expression will take part in making subsequent regular
expressions prettier.</para>
<para>User defined regular expressions can be deleted or renamed by
pressing the right mouse button on top of the regular expression in
question in the list box.</para>
</sect1>
</chapter>
<!-- ====================================================================== -->
<!-- Reporting a bug and Suggesting Features -->
<!-- ====================================================================== -->
<chapter id="bugreport">
<title>Reporting bugs and Suggesting Features</title>
<para>Bug reports and feature requests should be submitted through the
<ulink url="http://bugs.kde.org/">KDE Bug Tracking System</ulink>. <emphasis
role="strong">Before</emphasis> you report a bug or suggest a feature,
please check that it hasn't already been
<ulink url="http://bugs.kde.org/simple_search.cgi?id=kregexpeditor">reported/suggested.</ulink></para>
</chapter>
<!-- ====================================================================== -->
<!-- FAQ -->
<!-- ====================================================================== -->
<chapter id="faq">
<title>Frequently Asked Questions</title>
<sect1 id="question1">
<title>Does the regular expression editor support back references?</title>
<para>No currently this is not supported. It is planned for the next
version.</para>
</sect1>
<sect1 id="question2">
<title>Does the regular expression editor support showing matches?</title>
<para>No, hopefully this will be available in the next version.</para>
</sect1>
<sect1 id="question3">
<title>I'm the author of a KDE program, how can I use this widget in
my application?</title>
<para>See <ulink
url="http://developer.kde.org/documentation/library/cvs-api/classref/interfaces/KRegExpEditorInterface.html">The documentation for the class KRegExpEditorInterface</ulink>.</para>
</sect1>
<sect1 id="question4">
<title>I can't find the <emphasis>Edit Regular expression</emphasis> button in for example
konqueror on another KDE3 installation, why?</title>
<para>The regular expression widget is located in the package
KDE-utils. If you do not have this package installed, then the
<emphasis>edit regular expressions</emphasis> buttons will not
appear in the programs.</para>
</sect1>
</chapter>
<!-- ====================================================================== -->
<!-- Credits and Licenses -->
<!-- ====================================================================== -->
<chapter id="credits-and-license">
<title>Credits and Licenses</title>
<para>
Documentation is copyright 2001, Jesper K. Pedersen
<email>[email protected]</email>
</para>
&underGPL;
&underFDL;
</chapter>
</book>
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