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    <p>Related:</p> <p>A library that generates data matching a regular expression (with limitations): <a href="http://code.google.com/p/xeger/" rel="nofollow noreferrer">http://code.google.com/p/xeger/</a></p> <p>Several solutions, such as conversing a regex into a grammar: <a href="https://stackoverflow.com/questions/22115/using-regex-to-generate-strings-rather-than-match-them">Using Regex to generate Strings rather than match them</a></p> <hr> <p><strong>EDIT:</strong> Actually, <strong>you can make it work!!!</strong> The only thing to address is to impose some domain-specific constraints to preclude combinatorial explosion like a+. </p> <p>If you add to the Xeger class something like this:</p> <pre><code>public void enumerate() { System.out.println("enumerate: \"" + regex + "\""); int level = 0; String accumulated = ""; enumerate(level, accumulated, automaton.getInitialState()); } private void enumerate(int level, String accumulated, State state) { List&lt;Transition&gt; transitions = state.getSortedTransitions(true); if (state.isAccept()) { System.out.println(accumulated); return; } if (transitions.size() == 0) { assert state.isAccept(); return; } int nroptions = state.isAccept() ? transitions.size() : transitions.size() - 1; for (int option = 0; option &lt;= nroptions; option++) { // Moving on to next transition Transition transition = transitions.get(option - (state.isAccept() ? 1 : 0)); for (char choice = transition.getMin(); choice &lt;= transition.getMax(); choice++) { enumerate(level + 1, accumulated + choice, transition.getDest()); } } } </code></pre> <p>... and something like this to XegerTest:</p> <pre><code>@Test public void enumerateAllVariants() { //String regex = "[ab]{4,6}c"; String regex = "34\\.25\\.14\\.(227|228|229|230|243|244|245|246)"; Xeger generator = new Xeger(regex); generator.enumerate(); } </code></pre> <p>... you will get this:</p> <pre><code>------------------------------------------------------- T E S T S ------------------------------------------------------- Running nl.flotsam.xeger.XegerTest enumerate: "34\.25\.14\.(227|228|229|230|243|244|245|246)" 34.25.14.227 34.25.14.228 34.25.14.229 34.25.14.243 34.25.14.244 34.25.14.245 34.25.14.246 34.25.14.230 Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.114 sec </code></pre> <p>... and, guess what. For "[ab]{4,6}c" it correctly produces 112 variants.</p> <p>It's really a quick and dirty experiment, but it seems to work ;).</p>
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    1. POFrom within Java, how can I create a list of all possible numbers from a specific regular expression?
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    1. USfull.stack.ex
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    1. POFrom within Java, how can I create a list of all possible numbers from a specific regular expression?
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    1. CODon't just post links - at least include a summary of what they contain, and show how they are relevant.
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    2. COThis link references a package that can generate a number that matches the regex, but not all numbers (I think).
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      1. USChris Gerken
    3. CORight. And the solution can hardly be simpler than that provided by the library. At least it can be a starting point.
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