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    <p>The issue here is that the <code>Pattern</code> class does not implement <code>equals()</code>, so you can't compare the collections easily. To get around this, create your own Pattern wrapper class, which holds a <code>Pattern</code> and implements <code>equals()</code>. For example:</p> <pre><code>public class PatternWrapper{ private final Pattern pattern; public PatternWrapper(Pattern p) { this.pattern = p; } /** * @return the pattern */ public Pattern getPattern() { return pattern; } /* (non-Javadoc) * @see java.lang.Object#hashCode() */ @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + ((pattern == null) ? 0 : pattern.hashCode()); return result; } /* (non-Javadoc) * @see java.lang.Object#equals(java.lang.Object) */ @Override public boolean equals(Object obj) { if (obj == this) return true; if (!(obj instanceof PatternWrapper)) return false; PatternWrapper other = (PatternWrapper) obj; if (pattern == null) { if (other.pattern != null) return false; } else if (!pattern.toString().equals(other.pattern.toString())) return false; return true; } } </code></pre> <p>Now you can store <code>PatternWrapper</code> objects in your collections instead.</p> <p>Since you want to <strong>ignore</strong> ordering when comparing the collections, you can't simply call <code>equals</code> between the two collections, because that will compare corresponding elements. However, you can use another library such as Apache commons-collections <a href="http://commons.apache.org/collections/api/org/apache/commons/collections/CollectionUtils.html#isEqualCollection%28java.util.Collection,%20java.util.Collection%29" rel="nofollow noreferrer">CollectionUtils#isEqualCollection</a> to compare them independent of order. Take a look at this SO question for more info: <a href="https://stackoverflow.com/questions/1565214/is-there-a-way-to-check-if-two-collections-contain-the-same-elements-independent">Is there a way to check if two Collections contain the same elements, independent of order?</a></p> <p>I don't think there is a simple way of matching two regexes which have different patterns but match the same text. One way might be to have a list of test strings which you can run against each regex to see if they match.</p>
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    1. POComparing collections of Reg Ex Patterns
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    1. POComparing collections of Reg Ex Patterns
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    1. COUnless you have duplicate patterns and don't compare them all the time, you could put the patterns into sets before comparing.
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    2. CORecognizing that two regexes match exactly the same set of strings is non-trivial. You would have to reduce reduces each pattern to a so called minimal deterministic finite state machine and compare them instead.
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    3. COThank you very much, i had a feeling it was something about the .equals in Patterns that was my problem but was not sure. Also the reason why i did not have problems with the ordering for other filtering options i got is that Patterns are the only once i got in a list, rest are in sets, so thank you for pointing that out.
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