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POHow to add features missing from the Java regex implementation?
 

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  1. POHow to add features missing from the Java regex implementation?
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    <p>I'm new to Java. As a .Net developer, I'm very much used to the <code>Regex</code> class in .Net. The Java implementation of <code>Regex</code> (Regular Expressions) is not bad but it's missing some key features.</p> <p>I wanted to create my own helper class for Java but I thought maybe there is already one available. So is there any free and easy-to-use product available for Regex in Java or should I create one myself?</p> <p>If I would write my own class, where do you think I should share it for the others to use it?</p> <hr> <p><strong>[Edit]</strong></p> <p>There were complaints that I wasn't addressing the problem with the current <code>Regex</code> class. I'll try to clarify my question.</p> <p>In .Net the usage of a regular expression is easier than in Java. Since both languages are object oriented and very similar in many aspects, I expect to have a similar experience with using regex in both languages. Unfortunately that's not the case.</p> <hr> <p>Here's a little code compared in Java and C#. The first is C# and the second is Java:</p> <p><strong>In C#:</strong></p> <pre class="lang-C# prettyprint-override"><code>string source = "The colour of my bag matches the color of my shirt!"; string pattern = "colou?r"; foreach(Match match in Regex.Matches(source, pattern)) { Console.WriteLine(match.Value); } </code></pre> <p><strong>In Java:</strong></p> <pre class="lang-java prettyprint-override"><code>String source = "The colour of my bag matches the color of my shirt!"; String pattern = "colou?r"; Pattern p = Pattern.compile(pattern); Matcher m = p.matcher(source); while(m.find()) { System.out.println(source.substring(m.start(), m.end())); } </code></pre> <p>I tried to be fair to both languages in the sample code above.</p> <p>The first thing you notice here is the <code>.Value</code> member of the <code>Match</code> class (compared to using <code>.start()</code> and <code>.end()</code> in Java).</p> <p>Why should I create two objects when I can call a static function like <code>Regex.Matches</code> or <code>Regex.Match</code>, etc.?</p> <p>In more advanced usages, the difference shows itself much more. Look at the method <code>Groups</code>, dictionary length, <code>Capture</code>, <code>Index</code>, <code>Length</code>, <code>Success</code>, etc. These are all very necessary features that in my opinion should be available for Java too.</p> <p>Of course all of these features can be manually added by a custom proxy (helper) class. This is main reason why I asked this question. We don't have the breeze of <code>Regex</code> in Perl but at least we can use the .Net approach to <code>Regex</code> which I think is very cleverly designed.</p>
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    1. USMaarten Bodewes
    1. USAlireza Noori
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    1. COWhat sort of “helper” are you thinking of? It’s possible this is fixed in the current build, which has a lot of new features.
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    2. COThere's no question here without a specific list of issues that are of concern to you.
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    3. COCan you please focus this question with an example?
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