Regular Expressions 101

Explanation

Pro

Negative Lookahead(?!THE TREE IS GREEN)

THE TREE IS GREENthe literal text THE TREE IS GREEN (case sensitive)

Group 1(THE[ ]+TREE[ ]+IS[ ]+GREEN)

THEthe literal text THE (case sensitive)

Character Class[ ]+

+matches at least one character from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

TREEthe literal text TREE (case sensitive)

Character Class[ ]+

+matches at least one character from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

ISthe literal text IS (case sensitive)

Character Class[ ]+

+matches at least one character from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

GREENthe literal text GREEN (case sensitive)

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(?!THE TREE IS GREEN)(THE[ ]+TREE[ ]+IS[ ]+GREEN)

New

"In this text,
THE TREE IS GREEN should not match,
THE  TREE IS GREEN should
and so should THE  TREE   IS GREEN  
but  double-spaced  TEXT  SHOULD  NOT BE  FLAGGED outside the pattern."