<div>
If you won't have empty columns you could do something like:<br />
<br />

<pre><code id="code-170796">import java.util.regex.Pattern;
import java.util.regex.Matcher;
class Module1{
  public static void main(String[] asd){
  String sourcestring = &quot;source string to match with pattern&quot;;
  Pattern re = Pattern.compile(&quot;&quot;&quot;[^&quot;&quot;]*&quot;&quot;|[^,]+&quot;);
  Matcher m = re.matcher(sourcestring);
    if(m.find()){
      for( int groupIdx = 0; groupIdx &lt; m.groupCount(); groupIdx++ ){
        System.out.println( &quot;[&quot; + groupIdx + &quot;] = &quot; + m.group(groupIdx));
      }
    }
  }
}
</code></pre>
</div>


If you won't have empty columns you could do something like:



import java.util.regex.Pattern;
import java.util.regex.Matcher;
class Module1{
  public static void main(String[] asd){
  String sourcestring = "source string to match with pattern";
  Pattern re = Pattern.compile("""[^""]*""|[^,]+");
  Matcher m = re.matcher(sourcestring);
    if(m.find()){
      for( int groupIdx = 0; groupIdx < m.groupCount(); groupIdx++ ){
        System.out.println( "[" + groupIdx + "] = " + m.group(groupIdx));
      }
    }
  }
}


<div>
How about with empty columns?
</div>


<div>
Please note the emphasis on efficient algorithms that uses as much system-optimized code as possible.
</div>


Please note the emphasis on efficient algorithms that uses as much system-optimized code as possible.

<div>
Thanks for the question and the points.
</div>


<div>
<div class="content wysiwyg-content">
Hi,<br />
&nbsp; &nbsp;Can anyone help me with this problem:<br />
<br />
How can I split CSV file in Java (into separate columns), using built-in regex functions (for efficiency), but ignore everything in double quotes? So:<br />
<br />
1,2,3,&quot;hello, world!&quot;<br />
<br />
will be treated as 4 columns, not 5.
</div>
</div>


Hi,
   Can anyone help me with this problem:

How can I split CSV file in Java (into separate columns), using built-in regex functions (for efficiency), but ignore everything in double quotes? So:

1,2,3,"hello, world!"

will be treated as 4 columns, not 5.

How to split columns with exceptions

A regular expression ("regex") is a sequence of characters that define a search pattern, mainly for use in pattern matching with strings, or string matching, i.e. "find and replace"-like operations. Regular expression processors are found in several search engines, search and replace dialogs of several word processors and text editors, and in the command lines of text processing utilities, such as sed and AWK. Many programming languages provide regular expression capabilities, some built-in, for example Perl, JavaScript, Ruby, AWK, and Tcl, and others via a standard library, for example .NET languages, Java, Python and C++ (since C++11). Most other languages offer regular expressions via a library.

Regular Expressions

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Java App Servers

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.