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simulate backslash substitution identical to python parser

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Harald Kirsch wrote:
> 1) It is printed into a file which contains python code to be later
> executed.

file.write(repr(s))

> 2) It must be used immediately as a regexp.

assert re.match(re.escape(s), s) != None

(or in other words, re.escape(s) returns a pattern that matches
s if passed to the regular expression engine, for any possible s)

Cheers /F

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