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I have following regular expression in c# (ship|sub)(?<!^(shipment|subway)$)

which is used to check if the given data contains ship or sub when the data is not shipment or subway.

I want to write the same expression in java script. I tried several options with javascript negetive look behind.. But they are not serving my purpose: for an example: when i give shipment to the regular expression, it should not return ship(as i am excluding shipment in regular expression) .. however, when i give membership, it should give ship and match result true.

Could any one of you please help me .

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  • rearrange your post will be help everyone that read your post Commented Jan 28, 2013 at 14:16
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    3 people voted to close this question, presumably because 90% of the question was missing, but didn't try clicking "edit" to see if something went awry. The unescaped < in the user's code turned out to hide most of the question. Commented Jan 28, 2013 at 14:18
  • javascript regex parser does not support negative lookbehind. see this question Commented Jan 28, 2013 at 14:18

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Your regular expression should not have worked in .NET, either. Once you match "ship" or "sub", the negative lookbehind assertion would always be true: you matched "ship" or "sub", so the previous characters could never be "ment" or "bway", thus passing the assertion always. Instead, you must have meant:

\b(ship(?!ment)|sub(?!way))\b

This should work in Javascript as well, since it's only using negative lookahead assertions.

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