regex101: PCRE (Legacy) Match Workspace

Pro

^start of line

Non-Capturing Group(?:(?!\byellow thing\b.*?\bblue thing\b).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!\byellow thing\b.*?\bblue thing\b)

\ban ASCII word boundary

yellow thingthe literal text yellow thing (case sensitive)

\ban ASCII word boundary

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

\ban ASCII word boundary

blue thingthe literal text blue thing (case sensitive)

\ban ASCII word boundary

.any character (except for line terminators)

\ban ASCII word boundary

green thingthe literal text green thing (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

^(?:(?!\byellow thing\b.*?\bblue thing\b).)*\bgreen thing\b

New

Here we have a yellow thing. Here we have a blue thing. Clearly the green thing is best though. (Should NOT match)
You wanna buy some death sticks? I have a green thing. (MATCH)
We are on a yellow thing submarine? Look at that green thing over there! (MATCH)

Here we have a YELLOWyellow thing. Here we have a blue thing. Clearly the green thing is best though. (Should THIS match?)
We are on a blue thing yellow thing submarine? Look at that green thing over there! (SHOULT THIS MATCH?)