replacexform.html

来自「java类库详细讲解」· HTML 代码 · 共 151 行

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<TITLE>Searching and Replacing with Nonconstant Values Using a Regular Expression
(Java Developers Almanac Example)
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<META CONTENT="Patrick Chan" NAME="AUTHOR">
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        Order this book from <a href="/cgi-bin/scripts/redirect.pl?l=ex&url=http://www.amazon.com/exec/obidos/ASIN/0201752808/xeo">Amazon</a>.
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<FORM method="get" action="/cgi-bin/search/find.pl">
<INPUT size="25" name="words" type="text"><INPUT value="Search" type="submit">
</FORM>
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    <A HREF="../index.html">List of Packages</A>
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    <B><A HREF="../java.util.regex/pkg.html">java.util.regex</A></B><font color="#666666" SIZE="-2">
        &nbsp;[26 examples]
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        <B><A HREF="../java.util.regex/pkg.html#Searching%20and%20Replacing">Searching and Replacing</A></B><font color="#666666" SIZE="-2">
            &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;Related Examples
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e429. <a class="eglink" href="BasicReplace.html?l=rel">
    Quintessential Regular Expression Search and Replace Program
</a>
<br>


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<br>
        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
</a>&nbsp;&nbsp;

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

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