how remove python comment in js using regEx

Question

I'm not able to remove python comment from source, using javascript regular expression, and negative lookahead in general exclude an inline comment, excluding string

what I've tried is this

regex: /#.*(?!')/gi

test file:

class AAA:
    """
        item
    """
     ''''
    SRC_TYPE = (
        ('cs', 'src C# for all'),       # this is a comment a 'comment'
        ('cpp', 'C++'),
        ('ascript', 'a  '),#djshdjshdjshds
        ('script', 'tst C#')
    )

but don't works

Answer 1

This is tricky. I suggest using the trash-can approach and throw everything that does not need to be replaced in the full match and capture the desired output in group 1:

(?=["'])(?:"[^"\\]*(?:\\[\s\S][^"\\]*)*"|'[^'\\]*(?:\\[\s\S][^'\\]*)*')|(#.*$)

Demo

Sample using replace with callback function:

 const regex = /(?=["'])(?:"[^"\\\\]*(?:\\\\[\\s\\S][^"\\\\]*)*"|'[^'\\\\]*(?:\\\\[\\s\\S][^'\\\\]*)*')|(#.*$)/gm; const str = `class AAA: """ item """ '''' SRC_TYPE = ( ('cs', 'src C# for all'), # this is a comment a 'comment' ('cpp', 'C++'), ('ascript', 'a '),#djshdjshdjshds ('script', 'tst C#') )`; // The substituted value will be contained in the result variable const result = str.replace(regex, function(m, group1) { if (group1 == null ) return m; else return ""; }); console.log('Substitution result: ', result); 

The hard part is done by Casimir et Hippolyte's ECMA script regex .