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POHow can I use the same regular expression in different programming languages?
 

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  1. POHow can I use the same regular expression in different programming languages?
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    <p>I've seen <a href="https://stackoverflow.com/questions/1973343/regular-expressions-same-for-all-languages">this question</a>, and I know from experience that every language seems to support a different dialect of regex. I figure the problem has been around for a long time, so <em>somebody</em> must have wanted to do something about it.</p> <p>I have a pretty big project that involves JavaScript, Ruby, and Java, and all of them have to touch the same regular expressions. We picked Java as our "official" RE interpreter, which means that any time the other two languages need to evaluate an RE, they have to somehow pass it to a Java program, and that's starting to add up to a lot of overhead.</p> <p>If I could pick <em>any</em> RE dialect and invoke that at least semi-natively from all the languages, it'd be a huge step forward for us. Is this possible? Is it being done already? We looked at PCRE, and it's <em>technically</em> possible to invoke it via native bindings from Java and Ruby (though it leaves JS out in the cold), but I haven't found anybody actually doing it. Are we alone?</p> <p>ETA: a wrinkle I did not mention is that this system applies <em>user supplied</em> regex. (Yes, I understand that this is a <a href="https://stackoverflow.com/questions/4289923/in-which-languages-is-it-a-security-hole-to-use-user-supplied-regular-expression">security issue</a>, etc, but it's for in-house use by trusted, attributed users.) I can certainly suggest putting up a list of "don't do this" power-features to avoid, but I kind of hope it's not the best solution.</p>
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    1. COAh, user-supplied regular expressions. I knew we were missing something ;)
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    2. CO(I just wanted to post the stopgap that we wound up using, in case anybody cares. I'd still love to hear something better, though.) We picked Java regex. We can run these natively from Ruby code, provided the Ruby is run in JRuby. For our purposes, that's good enough. We also wrote a Java servlet that basically runs a regex against test data, as a RESTful service. This takes care of the JavaScript end, though of course it's not pretty :-/
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