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<TITLE>Applying Regular Expressions on the Contents of a File (Java Developers Almanac Example)
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    <B><A HREF="../java.util.regex/pkg.html">java.util.regex</A></B><font color="#666666" class="xsmall-font">
        &nbsp;[26 examples]
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  <h3>e425. Applying Regular Expressions on the Contents of a File</h3>

The matching routines in <code>java.util.regex</code> require that the input be a
<code>CharSequence</code> object.  This example implements a method that
efficiently returns the contents of a file in a <code>CharSequence</code> object.


<pre>    // Converts the contents of a file into a CharSequence
    // suitable for use by the regex package.
    public CharSequence fromFile(String filename) throws IOException {
        FileInputStream fis = new FileInputStream(filename);
        FileChannel fc = fis.getChannel();
    
        // Create a read-only CharBuffer on the file
        ByteBuffer bbuf = fc.map(FileChannel.MapMode.READ_ONLY, 0, (int)fc.size());
        CharBuffer cbuf = Charset.forName("8859_1").newDecoder().decode(bbuf);
        return cbuf;
    }
</pre>
Here is sample code that uses the method:

<pre>    try {
        // Create matcher on file
        Pattern pattern = Pattern.compile(<font color="#0066ff"><i>"pattern"</i></font>);
        Matcher matcher = pattern.matcher(fromFile(<font color="#0066ff"><i>"infile.txt"</i></font>));
    
        // Find all matches
        while (matcher.find()) {
            // Get the matching string
            String match = matcher.group();
        }
    } catch (IOException e) {
    }
</pre>
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            &nbsp;<b>Related Examples</b></font></td>
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e423. <a class="eglink" href="BasicMatch.html?l=rel">
    Quintessential Regular Expression Search Program
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e424. <a class="eglink" href="MatchExactly.html?l=rel">
    Determining If a String Matches a Pattern Exactly
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<br>

e426. <a class="eglink" href="RemDupSpace.html?l=rel">
    Removing Duplicate Whitespace in a String
</a>
<br>

e427. <a class="eglink" href="Greedy.html?l=rel">
    Greedy and Nongreedy Matching in a Regular Expression
</a>
<br>

e428. <a class="eglink" href="Escape.html?l=rel">
    Escaping Special Characters in a Pattern
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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
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util.regex/pkg.html?l=rel#Searching%20and%20Replacing">
    Searching and Replacing
</a>&nbsp;&nbsp;

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

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