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added details concerning the choice of the regular expression implementation. 

Also fixed an example, the substitution tag accepts the attribute expression, not pattern.


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@275677 13f79535-47bb-0310-9956-ffa450edef68
master
Antoine Levy-Lambert 21 years ago
parent
dc464794fe
commit
5ca341e1f4
1 changed files with 48 additions and 28 deletions
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  1. +48
    -28
      docs/manual/OptionalTasks/replaceregexp.html

+ 48
- 28
docs/manual/OptionalTasks/replaceregexp.html View File

@@ -4,10 +4,9 @@
<meta http-equiv="Content-Language" content="en-us">
<title>ReplaceRegExp Task</title>
</head>

<body>

<h2><a name="replace">ReplaceRegExp</a></h2>
<h2><a name="replaceregexp">ReplaceRegExp</a></h2>
<h3>Description</h3>
<p>ReplaceRegExp is a directory based task for replacing the
occurrence of a given regular expression with a substitution pattern
@@ -20,28 +19,7 @@ have been regenerated by this task.</p>
<p>Similar to <a href="../CoreTypes/mapper.html#regexp-mapper">regexp
type mappers</a> this task needs a supporting regular expression
library and an implementation of
<code>org.apache.tools.ant.util.regexp.Regexp</code>. Ant comes with
implementations for
<a href="http://java.sun.com/j2se/1.4/docs/api/java/util/regex/package-summary.html" target="_top">the java.util.regex package of JDK 1.4</a>,
<a href="http://jakarta.apache.org/regexp/" target="_top">jakarta-regexp</a>
and <a href="http://jakarta.apache.org/oro/" target="_top">jakarta-ORO</a>,
but you will still need the library itself.</p>
<p>
<i>
There are cross-platform issues for matches related to line terminator.
For example if you use $ to anchor your regular expression on the end of a line
the results might be very different depending on both your platform and the regular
expression library you use. It is 'highly recommended' that you test your pattern on
both Unix and Windows platforms before you rely on it.
<ul>
<li>Jakarta Oro defines a line terminator as '\n' and is consistent with Perl.</li>
<li>Jakarta RegExp uses a system-dependant line terminator.</li>
<li>JDK 1.4 uses '\n', '\r\n', '\u0085', '\u2028', '\u2029' as a default
but is configured in the wrapper to use only '\n' (UNIX_LINE)</li>
</ul>
We <b>strongly</b> recommend that you use Jakarta Oro.
</i>
</p>
<code>org.apache.tools.ant.util.regexp.Regexp</code>. See details <a href="#implementation">below</a>. </p>

<h3>Parameters</h3>
<table border="1" cellpadding="2" cellspacing="0">
@@ -74,6 +52,7 @@ We <b>strongly</b> recommend that you use Jakarta Oro.
i : Case Insensitive. Do not consider case in the match<br />
m : Multiline. Treat the string as multiple lines of input, using "^" and "$" as the start or end of any line, respectively, rather than start or end of string.<br />
s : Singleline. Treat the string as a single line of input, using "." to match any character, including a newline, which normally, it would not match.<br />
</td>
<td valign="top" align="center">No</td>
</tr>
<tr>
@@ -100,6 +79,47 @@ We <b>strongly</b> recommend that you use Jakarta Oro.
<p>replaces occurrences of the property name &quot;OldProperty&quot;
with &quot;NewProperty&quot; in a properties file, preserving the existing
value, in the file <code>${src}/build.properties</code></p>
<a name="implementation"/>
<h3>Choice of regular expression implementation</h3>
<p>
Ant comes with
wrappers for
<a href="http://java.sun.com/j2se/1.4/docs/api/java/util/regex/package-summary.html" target="_top">the java.util.regex package of JDK 1.4</a>,
<a href="http://jakarta.apache.org/regexp/" target="_top">jakarta-regexp</a>
and <a href="http://jakarta.apache.org/oro/" target="_top">jakarta-ORO</a>,
See <a href="../install.html#librarydependencies">installation dependencies</a>
concerning the supporting libraries.</p>
<p>
The system property <code>ant.regexp.regexpimpl</code> governs which regular expression implementation will be chosen.
Possible values for this property are :
<ul>
<li>
org.apache.tools.ant.util.regexp.Jdk14RegexpRegexp
</li>
<li>
org.apache.tools.ant.util.regexp.JakartaOroRegexp
</li>
<li>
org.apache.tools.ant.util.regexp.JakartaRegexpRegexp
</li>
</ul>
It can also be another implementation of the interface <code>org.apache.tools.ant.util.regexp.Regexp</code>.
If <code>ant.regexp.regexpimpl</code> is not defined, ant checks in the order Jdk14Regexp, JakartaOroRegexp,
JakartaRegexp for the availability of the corresponding library. The first of these 3 which is found will be used.</p>
<p>
There are cross-platform issues for matches related to line terminator.
For example if you use $ to anchor your regular expression on the end of a line
the results might be very different depending on both your platform and the regular
expression library you use. It is 'highly recommended' that you test your pattern on
both Unix and Windows platforms before you rely on it.
<ul>
<li>Jakarta Oro defines a line terminator as '\n' and is consistent with Perl.</li>
<li>Jakarta RegExp uses a system-dependant line terminator.</li>
<li>JDK 1.4 uses '\n', '\r\n', '\u0085', '\u2028', '\u2029' as a default
but is configured in the wrapper to use only '\n' (UNIX_LINE)</li>
</ul>
<em>We <b>strongly</b> recommend that you use Jakarta Oro.</em>
</p>
<h3>Parameters specified as nested elements</h3>
<p>This task supports a nested <a href="../CoreTypes/fileset.html">FileSet</a>
element.</p>
@@ -107,14 +127,14 @@ value, in the file <code>${src}/build.properties</code></p>
the regular expression. You can use this element to refer to a previously
defined regular expression datatype instance.</p>
<blockquote>
&lt;regexp id="id" pattern="expression"/&gt;<br />
&lt;regexp id="id" pattern="alpha(.+)beta"/&gt;<br />
&lt;regexp refid="id"/&gt;
</blockquote>
<p>This task supports a nested <i>Substitution</i> element to specify
the substitution pattern. You can use this element to refer to a previously
defined substitution pattern datatype instance.</p>
<blockquote>
&lt;substitution id="id" pattern="expression"/&gt;<br />
&lt;substitution id="id" expression="beta\1alpha"/&gt;<br />
&lt;substitution refid="id"/&gt;
</blockquote>
<h3>Examples</h3>
@@ -151,8 +171,8 @@ would converted to
&lt;html&gt; &lt;body&gt;
&lt;h1&gt; T E S T &lt;/h1&gt; &lt;/body&gt;&lt;/html&gt;
</pre>
<hr>
</p>
<hr/>
<p align="center">Copyright &copy; 2001-2003 Apache Software Foundation. All rights
Reserved.</p>



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