Regular Expression Crashes in Ruby and Javascript?

Your regular expression combines the worst-case for regular expressions repeatedly. Your regex gets stuck backtracking over the string when the regex fails to match. Take out the s and?

S and your regular expression will perform admirably See swtch.com/~rsc/regexp/regexp1.html for a thorough explanation of why you can't do what you are trying to do in a performant manner My personal opinion is that you should just check for and send a confirmation e-mail, but you can probably find a regex elsewhere on the web that will perform adequately while matching most e-mail addresses.

Your regular expression combines the worst-case for regular expressions repeatedly. Your regex gets stuck backtracking over the string when the regex fails to match. Take out the *s and?

S and your regular expression will perform admirably. See swtch.com/~rsc/regexp/regexp1.html for a thorough explanation of why you can't do what you are trying to do in a performant manner. My personal opinion is that you should just check for /@/ and send a confirmation e-mail, but you can probably find a regex elsewhere on the web that will perform adequately while matching most e-mail addresses.

Thanks for your response, unfortunately we don't have the option of confirmation emails as the system is unmonitored and runs this autonomously. Also we need to account for everything which is allowed under the RFC specifications. We found most rules were too strict.

– Jeremy B. Aug 29 at 19:48 1 @Jeremy you're not really ever validating an e-mail, though. Even an e-mail that passes your RFC-compliant filter can still be an invalid address.

– Matt Aug 29 at 19:51.

Try this for example, rubular eats this well ^A-Za-z0-9. _%+-+@A-Za-z0-9. -+\.

A-Za-z{2,6}$ By the way google first serp leads to more examples: regular-expressions.info/email.html.

This is a nice start but you lopped off IP addresses. – Jeremy B. Aug 29 at 19:57.

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