regex101: PCRE (Legacy) Match Workspace

Pro

1st Alternative^(?=.*\bKeyWord2\b)

^start of line

Positive Lookahead(?=.*\bKeyWord2\b)

.*any character (except for line terminators), repeated any number of times

\ban ASCII word boundary

KeyWord2the literal text KeyWord2 (case sensitive)

\ban ASCII word boundary

2nd Alternative\G.*?\K\bKEYWORD1\b

\Gstart of current search

.*?any character (except for line terminators), repeated any number of times

\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match

\ban ASCII word boundary

KEYWORD1the literal text KEYWORD1 (case sensitive)

\ban ASCII word boundary

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

25 tokens

Regular Expression

^(?=.*\bKeyWord2\b)|\G.*?\K\bKEYWORD1\b

New

The KeyWord2 before one KEYWORD1 here
The KEYWORD1 before one KeyWord2 here
The KEYWORD1 before KeyWord2 then KEYWORD1 and KEYWORD1 again
The KeyWord2 before KEYWORD1 and KEYWORD1 again
The KEYWORD1 before one KeyWord99 here
The KEYWRD before one KeyWord2 here

Extraction

The KeyWord2 before one KEYWORD1 here
The KEYWORD1 before one KeyWord2 here
The KEYWORD1 before KeyWord2 then KEYWORD1 and KEYWORD1 again
The KeyWord2 before KEYWORD1 and KEYWORD1 again
The KEYWORD1 before one KeyWord99 here
The KEYWRD before one KeyWord2 here