Add regexp/no-invalid-regexp rule
#288
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+180
−0
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This fixes #283.
This is a branch of #287.
The implementation of the rule is quite simple. The only interesting part is the report location. While not documented, regexpp actually tells us where the syntax error occurs. The only problem is that this position isn't exact. It's off by one at times (see code comments). That being said, the error reporting is quite good.