how to exclude a character once-CodePudding

I'm trying to exclude a character once (and everything after):
here is some example

val=aabbcc,val2==aabb,val3=aa==bb, val4=a=bccc

the pattern is: (any character except =) = (any character) ,here is the result that I wanted :

val='aabbcc',val2='=aabb',val3='aa==bb', val4='a=bccc'

I tried : ([^=] )=([^=] ) and ([^=] )=(.*) but it doesn't work

CodePudding user response：

You can use

([^,=] )=(.*?)(?=,[^,=] =|$)

See the regex demo.

Details:

([^,=] ) - Group 1: one or more chars other than comma and =
= - = char
(.*?) - Group 2: any zero or more chars other than line break chars as few as possible
(?=,[^,=] =|$) - a location that is either immediately followed with a comma and then zero or more chars other than , and = and then a = char, or end of string.

If you need to get rid of leading/trailing whitespaces, you may use this more complex pattern:

([^\s,=](?:[^,=]*[^,=\s])?)\s*=\s*(\S.*?)?\s*(?=,[^,=] =|$)

See this regex demo.

See the Python demo:

import re
text = "val=aabbcc,val2==aabb,val3=aa==bb, val4=a=bccc"
result = re.findall(r'([^\s,=](?:[^,=]*[^,=\s])?)\s*=\s*(\S.*?)?\s*(?=,[^,=] =|$)', text)
print(dict(result))

Output:

{'val': 'aabbcc', 'val2': '=aabb', 'val3': 'aa==bb', 'val4': 'a=bccc'}