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I have a string, say r"a". I want to replace every r"a" with the string r"\1", but my regex engine does not understand this.
I have tried:
r"\1" — crashes (can’t match group 1 because there is no group 1)r"\\1" — crashes (not sure why)Is this a limitation of my (proprietary) regex engine, or is it a general problem? Is there an elegant way of solving it? (I could e.g. replace “a” by “/1” and then StrReplace( “/”, r”\” )… but that’s not nice!)
The correct way would be to use
r"\\1"as a replace string. So if your proprietary regex engine/language chokes on a\\, you should fix this bug.If you look at your example, you don’t need a regex engine at all. But perhaps the example is simpler than the actual requirement…