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<TITLE>Parsing Character-Separated Data with 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#Tokenizing">Tokenizing</A></B><font color="#666666" class="xsmall-font">
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  <h3>e431. Parsing Character-Separated Data with a Regular Expression</h3>

A line from a flat-file is typically formatted using a separator
character to separate the fields.  If the separator is simply a comma,
tab, or single character, the <code>StringTokenizer</code> class can be used to
parse the line into fields.  If the separator is more complex (e.g., a
space after a comma), a regular expression is needed.
<code>String.split()</code> conveniently parses a line using a regular
expression to specify the separator.

<P> <code>String.split()</code> returns only the nondelimiter strings.  To
obtain the delimiter strings, see <a href="../java.util.regex/Tokenize.html" class="eglink"><b>e432</b> Parsing a String into Tokens Using a Regular Expression</a>.
 
<P> Note: The <code>StringTokenizer</code> does not conveniently handle
empty fields properly.  For example, given the line <code>a,,b</code>, rather
than return three fields (the second being empty), the
<code>StringTokenizer</code> returns two fields, discarding the empty field.
<code>String.split()</code> properly handles empty fields.


<pre>    // Parse a comma-separated string
    String inputStr = <font color="#0066ff"><i>"a,,b"</i></font>;
    String patternStr = <font color="#0066ff"><i>","</i></font>;
    String[] fields = inputStr.split(patternStr);
    // ["a", "", "b"]
    
    // Parse a line whose separator is a comma followed by a space
    inputStr = <font color="#0066ff"><i>"a, b, c,d"</i></font>;
    patternStr = <font color="#0066ff"><i>", "</i></font>;
    fields = inputStr.split(patternStr, -1);
    // ["a", "b", "c,d"]
    
    // Parse a line with and's and or's
    inputStr = <font color="#0066ff"><i>"a, b, and c"</i></font>;
    patternStr = <font color="#0066ff"><i>"[, ]+(and|or)*[, ]*"</i></font>;
    fields = inputStr.split(patternStr, -1);
    // ["a", "b", "c"]
</pre>
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            &nbsp;<b>Related Examples</b></font></td>
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e432. <a class="eglink" href="Tokenize.html?l=rel">
    Parsing a String into Tokens Using a Regular Expression
</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#Searching%20and%20Replacing">
    Searching and Replacing
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