I want to be able to match the following texts
top of radio 54 / bottom 27
radio top 54 / bottom 27
The word top can be before or after radio only for the first half of the text (before /). top that appears after / should not be matched.
I tried to use the following pattern that encloses the lookahead for the first half with parentheses.
((?=top).*radio\s\d{2}\s)\/\D*bottom\s\d{2}
But it doesn't work like I expected. Only matches first string, but not second.
CodePudding user response：
You may use this regex with a lookahead:
^(?=[^/]*\btop\s)[^/]*radio[^/] \d{2}\s /\D*bottom\s \d{2}$
RegEx Breakup:
^: Start(?=[^/]*\btop\s): Lookahead to assert presence of wordtopbeing present before matching a/. This is to ensure we match wordtopbefore/only[^/]*: Match 0 more of any char that is not a/radio: Matchradio[^/]: Match 1 of any char that is not a/\d{2}: Match 2 digits\s: Match 1 whitespaces/: Match a/\D*: Match 0 or more non-digitsbottom: Matchbottom\s: Match 1 whitespace\d{2}: Match 2 digits$: End