Regular Expressions 101

Pro

ERRORthe literal text ERROR (case sensitive)

\s+any whitespace character, repeated at least once

Negative Lookahead(?!MO already exist)

MO already existthe literal text MO already exist (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

Detailed match information will be displayed here automatically.

25 tokens

ERROR\s+(?!MO already exist).*$

New

ERROR  
we have an ERROR here da da da  
ERROR Parent MO not found  
ERROR anything else is here  
ERROR MO already exists

ERROR  
we have an ERROR here da da da  
ERROR Parent MO not found  
ERROR anything else is here  
ERROR MO already exists