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<TITLE>Searching and Replacing with Nonconstant Values Using a Regular Expression (Java Developers Almanac Example)
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    <A HREF="../java.util.regex/pkg.html">java.util.regex</A><font color="#666666" class="xsmall-font">
        &nbsp;[26 examples]
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        <B><A HREF="../java.util.regex/pkg.html#Searching and Replacing">Searching and Replacing</A></B><font color="#666666" class="xsmall-font">
            &nbsp;[2 examples]
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  <h3>e430. Searching and Replacing with Nonconstant Values Using a Regular Expression</h3>

The simplest way to replace all occurrences of a pattern in a
<code>CharSequence</code> is to use <code>Matcher.replaceAll()</code>. However, this method
is restricted to replacement values that are constant.  If the
replacement value is dynamic (e.g., converting the match to
uppercase), <code>Matcher.appendReplacement()</code> must be used.

<P> This example demonstrates the use of
<code>Matcher.appendReplacement()</code> by converting all words that match
<code>[a-zA-Z]+[0-9]+</code> to uppercase.


<pre>    CharSequence inputStr = <font color="#0066ff"><i>"ab12 cd efg34"</i></font>;
    String patternStr = <font color="#0066ff"><i>"([a-zA-Z]+[0-9]+)"</i></font>;
    
    // Compile regular expression
    Pattern pattern = Pattern.compile(patternStr);
    Matcher matcher = pattern.matcher(inputStr);
    
    // Replace all occurrences of pattern in input
    StringBuffer buf = new StringBuffer();
    boolean found = false;
    while ((found = matcher.find())) {
        // Get the match result
        String replaceStr = matcher.group();
    
        // Convert to uppercase
        replaceStr = <font color="#0066ff"><i>replaceStr.toUpperCase()</i></font>;
    
        // Insert replacement
        matcher.appendReplacement(buf, replaceStr);
    }
    matcher.appendTail(buf);
    
    // Get result
    String result = buf.toString();
    // AB12 cd EFG34
</pre>
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            &nbsp;<b>Related Examples</b></font></td>
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e429. <a class="eglink" href="BasicReplace.html?l=rel">
    Quintessential Regular Expression Search and Replace Program
</a>
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        See also: 
<a class="eglink" href="/egs/java.util.regex/pkg.html?l=rel#Flags">
    Flags
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util.regex/pkg.html?l=rel#Groups">
    Groups
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util.regex/pkg.html?l=rel#Lines">
    Lines
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util.regex/pkg.html?l=rel#Paragraphs">
    Paragraphs
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<a class="eglink" href="/egs/java.util.regex/pkg.html?l=rel#Tokenizing">
    Tokenizing
</a>&nbsp;&nbsp;

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