Regular Expressions 101

Pro

^start of line

*?repeats the group contents below any number of times:

.any character (except for line terminators)

1st Alternativecustom

customthe literal text custom (case sensitive)

2nd Alternativeonetomany

onetomanythe literal text onetomany (case sensitive)

3rd Alternativemanytomany

manytomanythe literal text manytomany (case sensitive)

4th Alternativeatom

atomthe literal text atom (case sensitive)

5th Alternativetomcat

tomcatthe literal text tomcat (case sensitive)

6th Alternativetomorrow

tomorrowthe literal text tomorrow (case sensitive)

7th Alternativeautomatic

automaticthe literal text automatic (case sensitive)

Group 1(tom)

tomthe literal text tom (case sensitive)

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

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

^(?:.(?!custom|onetomany|manytomany|atom|tomcat|tomorrow|automatic))*?(tom).*

New

foo bar test
another tom test
but wait, automatic
but wait, tomorrow
but wait, atom tom

foo bar test
another tom test
but wait, automatic
but wait, tomorrow
but wait, atom tom