RegEx Useful resources

[Darkzaelus]

http://www.txt2re.com/index-php.php3
Best thing this side of cheese! Saved my life many a time this has.

Cheers,

Darkzaelus

[jason.carter]

Try the regexcoach. It is a windows application and you can try out various patterns on sample text.

[piyushj]

regular expression for the only strings that are not generated over {a,b} by the expression (a+ b)* a (a+b)*
reasoning please

[prometheuzz]

regular expression for the only strings that are not generated over {a,b} by the expression (a+ b)* a (a+b)*
reasoning please

This thread is not meant to post questions. Try posting a new thread in the regex forum. Note that the "question" in it's current form, is pretty meaningless and is not likely to get any helpful answers, I think.

[UrbanFuturistic]

For those using mb_ereg functions with the default Ruby syntax Rubular gives immediate feedback on the results of an expression tested against input. I've been using it to test against all kinds of UTF-8 input (Chinese, Hebrew, Korean, etc).

[AlanM]

This one is new: a way to visualize regular expressions as a diagram. It's an Eclipse plugin called Graphrex: http://crotonresearch.com/graphrex

The website says it is useful for understanding regular expressions, and for documenting existing ones. The diagrams can be exported as images.

Cheers