regex101: PCRE (Legacy) Match Workspace

^start of line

The thing isthe literal text The thing is (case sensitive)

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

\ban ASCII word boundary

Group 1(S\d)

Sthe literal S (83₁₀ / 123₈ / 53₁₆) (case sensitive)

\da digit

Negative Lookahead(?!.*\b(?:blue|red)\b)

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

\ban ASCII word boundary

Non-Capturing Group(?:blue|red)

1st Alternativeblue

bluethe literal text blue (case sensitive)

2nd Alternativered

redthe literal text red (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

^The thing is.*\b(S\d)(?!.*\b(?:blue|red)\b)

New

TRUE
The thing is S2w697 and green
The thing is S2e697 and yellow
The thing is S2b697 and pink

FALSE
The thing is S25697 and blue
The thing is S256b7 and red
The thing is S2e697 and blue thing
The thing is S2b697 and red thing

Extraction

TRUE
The thing is S2w697 and green
The thing is S2e697 and yellow
The thing is S2b697 and pink

FALSE
The thing is S25697 and blue
The thing is S256b7 and red
The thing is S2e697 and blue thing
The thing is S2b697 and red thing