<?xml version="1.0" encoding="utf-8" ?> <!-- for emacs: -*- coding: utf-8 -*- -->
<!-- Apache may like this line in the file .htaccess: AddCharset utf-8 .html -->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0 plus SVG 1.1//EN" "http://www.w3.org/2002/04/xhtml-math-svg/xhtml-math-svg-flat.dtd" >
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head><title>replace(String,String,String) -- regular expression replacement of substrings</title>
<link rel="stylesheet" type="text/css" href="../../../../Macaulay2/Style/doc.css"/>
</head>
<body>
<table class="buttons">
<tr>
<td><div><a href="_replace_lp__Z__Z_cm__Thing_cm__Visible__List_rp.html">next</a> | <a href="_reorganize.html">previous</a> | <a href="_replace_lp__Z__Z_cm__Thing_cm__Visible__List_rp.html">forward</a> | <a href="_reorganize.html">backward</a> | up | <a href="index.html">top</a> | <a href="master.html">index</a> | <a href="toc.html">toc</a> | <a href="http://www.math.uiuc.edu/Macaulay2/">Macaulay2 web site</a></div>
</td>
</tr>
</table>
<hr/>
<div><h1>replace(String,String,String) -- regular expression replacement of substrings</h1>
<div class="single"><h2>Synopsis</h2>
<ul><li><div class="list"><dl class="element"><dt class="heading">Usage: </dt><dd class="value"><div><tt>replace(p,r,s)</tt></div>
</dd></dl>
</div>
</li>
<li><span>Function: <a href="_replace.html" title="replacement in strings and lists">replace</a></span></li>
<li><div class="single">Inputs:<ul><li><span><tt>p</tt>, <span>a <a href="___String.html">string</a></span>, a regular expression describing a pattern</span></li>
<li><span><tt>r</tt>, <span>a <a href="___String.html">string</a></span>, a replacement string</span></li>
<li><span><tt>s</tt>, <span>a <a href="___String.html">string</a></span>, a subject string to be searched</span></li>
</ul>
</div>
</li>
<li><div class="single">Outputs:<ul><li><span><span>a <a href="___String.html">string</a></span>, the string obtained from <tt>s</tt> by replacing its substrings matching <tt>p</tt> by copies of <tt>r</tt>.</span></li>
</ul>
</div>
</li>
</ul>
</div>
<div class="single"><h2>Description</h2>
<div>If a backslash followed by a digit occurs in <tt>r</tt>, then in the result they are replaced by the string matching the corresponding parenthesized subexpression of <tt>p</tt>.<table class="examples"><tr><td><pre>i1 : replace ("[a-z]+", "x", "Dog cat cat.")
o1 = Dx x x.</pre>
</td></tr>
<tr><td><pre>i2 : replace ("([a-z]+)", "(\\1)", "Dog cat cat.")
o2 = D(og) (cat) (cat).</pre>
</td></tr>
</table>
</div>
</div>
<div class="single"><h2>See also</h2>
<ul><li><span><a href="_regular_spexpressions.html" title="">regular expressions</a></span></li>
<li><span><a href="_regex.html" title="">regex</a></span></li>
<li><span><a href="_replace.html" title="replacement in strings and lists">replace</a> -- replacement in strings and lists</span></li>
</ul>
</div>
</div>
</body>
</html>
