Regular Expressions - Java source method identification

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I am trying to identify methods in Java source. All was going well, but this one brought my code to a halt because my method did not identify the class name. It was messy in any case, I firstly identified that it was a method, then I ran a second expression to try and extract the class name, which is where it went wrong. Here is my specifics:

example:

public double calculateAmount (int iCode, double dRate, double dAmount) {

Rules:

1. It will always start with public
2. The datatype may be anything (i.e the double may be int, void, etc)
3. It may or may not include parameters between the parentheses
4. The line will always end with {

I have had advice in a previous question to treat the full source as one string. For a number of reasons and because I am already a long way into line-by-line analysis, I am working one line at a time.

So far I have this but have not been able to resolve it in a Regex tester:

1. I can identify public :
\bpublic
2. Then we have a space and another word :
\bpublic\s+\w+\s+
3. Then we have my method name - how do I capture this?
\bpublic\s+\w+\s+ ~~~~~~
4. Next we have 2 parentheses, possibly with something in between, but not necessarily
\bpublic\s+\w+\s+ ~~~~~~ \(.*\)
5. We end with a { :
\bpublic\s+\w+\s+ ~~~~~~ \(.*\)\s+\{

Thanks in advance!

Posted 23-Feb-13 2:48am

Steve Vink

Updated 23-Feb-13 2:53am

Mike Meinz

v2

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Mike Meinz · Accepted Answer · 2013-02-23T03:10:00

I used the Regular Expression Generator at www.txt2re.com[^] to generate this:

C#

// URL that generated this code:
// http://txt2re.com/index-csharp.php3?s=public%20double%20calculateAmount%20(int%20iCode,%20double%20dRate,%20double%20dAmount)%20{&-9&21&6&22&2&23&-99&29&-161&-98&1

using System;
using System.Text.RegularExpressions;

namespace ConsoleApplication1
{
  class Program
  {
    static void Main(string[] args)
    {
      string txt="public double calculateAmount (int iCode, double dRate, double dAmount) {";

      string re1="(public)";    // Word 1
      string re2="(\\s+)";  // White Space 1
      string re3="((?:[a-z][a-z]+))";   // Word 2
      string re4="(\\s+)";  // White Space 2
      string re5="((?:[a-z][a-z]+))";   // Word 3
      string re6="(\\s+)";  // White Space 3
      string re7="(\\(.*\\))";  // Round Braces 1
      string re8="(\\s+)";  // White Space 4
      string re9="(\\{)";   // Any Single Character 1

      Regex r = new Regex(re1+re2+re3+re4+re5+re6+re7+re8+re9,RegexOptions.IgnoreCase|RegexOptions.Singleline);
      Match m = r.Match(txt);
      if (m.Success)
      {
            String word1=m.Groups[1].ToString();
            String ws1=m.Groups[2].ToString();
            String word2=m.Groups[3].ToString();
            String ws2=m.Groups[4].ToString();
            String word3=m.Groups[5].ToString();
            String ws3=m.Groups[6].ToString();
            String rbraces1=m.Groups[7].ToString();
            String ws4=m.Groups[8].ToString();
            String c1=m.Groups[9].ToString();
            Console.Write("("+word1.ToString()+")"+"("+ws1.ToString()+")"+"("+word2.ToString()+")"+"("+ws2.ToString()+")"+"("+word3.ToString()+")"+"("+ws3.ToString()+")"+"("+rbraces1.ToString()+")"+"("+ws4.ToString()+")"+"("+c1.ToString()+")"+"\n");
      }
      Console.ReadLine();
    }
  }
}