regex - Replace string by matching using regular expression python -

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original string:

necessary information leave comment unnecessary information

required string:

necessary information

i have multiple strings in above mentioned 'original string' format. want remove 'leave comment' , 'unnecessary information'.

since 'leave comment' common in string can build regular expression on that? , use in

string.replace( string , pattern )

the pattern here regular expression. how can write re this?

>>> s 'necessary information leave comment unnecessary information' >>> re.sub(r'\sleave comment.*', '', s) 'necessary information'

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