regex101: PCRE (Legacy) Match Workspace

Pro

1st Alternative.*yellow.*(*SKIP)(*F)

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

yellowthe literal text yellow (case sensitive)

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

(*SKIP)acts like (*PRUNE), but the next unanchored match attempt starts where (*SKIP) was reached instead of at the next subject character

(*F)forces the current match attempt to fail at this position

2nd Alternative^.*\bblue\b(?=.*brown).*$

^start of line

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

\ban ASCII word boundary

bluethe literal text blue (case sensitive)

\ban ASCII word boundary

Positive Lookahead(?=.*brown)

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

brownthe literal text brown (case sensitive)

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

$end of line

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

.*yellow.*(*SKIP)(*F)|^.*\bblue\b(?=.*brown).*$

New

yellow blue brown                    // shouldn't match
f blue brown                         // should match
sdff blue brown                      // should match
asdf  f blue c                       // shouldn't match
yellow blue fblue b f brown          // shouldn't match
sdff blue brown yellow               // shouldn't match
purple blue brown

Extraction

yellow blue brown                    // shouldn't match
f blue brown                         // should match
sdff blue brown                      // should match
asdf  f blue c                       // shouldn't match
yellow blue fblue b f brown          // shouldn't match
sdff blue brown yellow               // shouldn't match
purple blue brown