Regular Expressions 101

Pro

^start of line

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

Positive Lookahead(?=\s*(?:Part1|Part2|Part3|Part4))

\s*any whitespace character, repeated any number of times

Non-Capturing Group(?:Part1|Part2|Part3|Part4)

1st AlternativePart1

Part1the literal text Part1 (case sensitive)

2nd AlternativePart2

Part2the literal text Part2 (case sensitive)

3rd AlternativePart3

Part3the literal text Part3 (case sensitive)

4th AlternativePart4

Part4the literal text Part4 (case sensitive)

Global pattern flags

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

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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

^.*?(?=\s*(?:Part1|Part2|Part3|Part4))

New

MatchOnlyMe! Part1 Part2 Part3 Part4
MatchOnlyMe! Part2 Part3 Part4
MatchOnlyMe! Part2 Part3
MatchOnlyMe! Part1 Part3 Part4
MatchOnlyMe! Part3 Part4
MatchOnlyMe! Part4
MatchOnlyMe! Part2
MatchOnlyMe! Part2 Part4
MatchOnlyMe! Part1 Part4
MatchOnlyMe! Part1 Part2 Part4