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Place the regular expression you want to validate between the forward slashes in the eval block.
There are 4 alternatives - vote for the best!
If you can do better, submit your command here.
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might want to mention that you would need to put your regular expression between the "/"'s of the qr//
I would also argue that if you wanted more valuable output to add the -w flag along with the -e flag: -we
That turns on helpful warnings which give you more specifics about what went wrong with your regex