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<TITLE>Using the Captured Text of a Group within a Replacement Pattern
(Java Developers Almanac Example)
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<h3>
e440.
Using the Captured Text of a Group within a Replacement Pattern</h3>
Just as it is possible to use the value of a group within the same
pattern (see <a href="../java.util.regex/GroupInPat.html" class="eglink"><font size="-1"><b>e439</b> Using the Captured Text of a Group within a Pattern</font></a>), it is also
possible to use a group value in the replacement pattern. Instead of
a backslash, the form of the reference is <code>$n</code> where n is a group
number starting from 0 (see <a href="../java.util.regex/Group.html" class="eglink"><font size="-1"><b>e436</b> Capturing Text in a Group in a Regular Expression</font></a> for more
information on groups).
<pre>
// Compile regular expression
String patternStr = <font color="#0066ff"><i>"\\((\\w+)\\)"</i></font>;
String replaceStr = <font color="#0066ff"><i>"<$1>"</i></font>;
Pattern pattern = Pattern.compile(patternStr);
// Replace all (\w+) with <$1>
CharSequence inputStr = <font color="#0066ff"><i>"a (b c) d (ef) g"</i></font>;
Matcher matcher = pattern.matcher(inputStr);
String output = matcher.replaceAll(replaceStr);
// a (b c) d <ef> g
</pre>
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Related Examples
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e436. <a class="eglink" href="Group.html?l=rel">
Capturing Text in a Group in a Regular Expression
</a>
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e437. <a class="eglink" href="GroupIx.html?l=rel">
Getting the Indices of a Matching Group in a Regular Expression
</a>
<br>
e438. <a class="eglink" href="NoGroup.html?l=rel">
Using a Non-Capturing Group in a Regular Expression
</a>
<br>
e439. <a class="eglink" href="GroupInPat.html?l=rel">
Using the Captured Text of a Group within a Pattern
</a>
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See also:
<a class="eglink" href="/egs/java.util.regex/pkg.html?l=rel#Flags">
Flags
</a>
<a class="eglink" href="/egs/java.util.regex/pkg.html?l=rel#Lines">
Lines
</a>
<a class="eglink" href="/egs/java.util.regex/pkg.html?l=rel#Paragraphs">
Paragraphs
</a>
<a class="eglink" href="/egs/java.util.regex/pkg.html?l=rel#Searching%20and%20Replacing">
Searching and Replacing
</a>
<a class="eglink" href="/egs/java.util.regex/pkg.html?l=rel#Tokenizing">
Tokenizing
</a>
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