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Just be careful because ? itself can be used as a quantifier as well. Personally, I suggest to think of quantifiers in this way: greedy * any to 0 + any to 1 ? 1 to 0 {n,m}        m to n non-greedy *? 0 to any +? 1 to any ?? 0 to 1 {n,m}?      n to m I believe It helps to better understand how the r...

There are several possibilities to do that. Here are described two possibilities. There can be executed a Perl regular expression Replace all with the search expression ^ (?! <RX ) .* (?: \r\n|$ ) and use as replace string either just \r\n to just change the lines not starting with <RX to an empty l...

A Perl regular expression search with (?<! <W ) •water searches for •water and uses a negative lookbehind to verify if there is not " <W " preceding found •water for a positive match.