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Possible Duplicate:
What is the best regular expression generator/explainer
Is there a way to go from a regular expression to what does it mean?
for example I found the following expression in an old code:
.*[^a-zA-Z0-9_].*
…but I do not know if this is 100% correct or if it contains any unnecessary characters?
Is there any online tool that does regular expression translation?
I use http://gskinner.com/RegExr/. You can enter both the Regex and the text you want to apply it to. It also contains a couple of samples.