Regular Expressions 101

Pro

Group 1(\bfoo)

\ban ASCII word boundary

foothe literal text foo (case sensitive)

the literal (32₁₀ / 40₈ / 20₁₆)

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

Non-Capturing Group(?: \w*?((?:bar)+)\w*)?

?repeats the group contents below at most once:

the literal (32₁₀ / 40₈ / 20₁₆)

\w*?any word character, repeated any number of times

Group 2((?:bar)+)

Non-Capturing Group(?:bar)+

+repeats the group contents below at least once:

barthe literal text bar (case sensitive)

\w*any word character, 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

(\bfoo) .*?(?: \w*?((?:bar)+)\w*)?$

New

foo ignoreme barbarbar
foo ignoreme bar
foo ignoreme
foo something abcbar
foo something abcbarbar123

foo ignoreme barbarbar
foo ignoreme bar
foo ignoreme
foo something abcbar
foo something abcbarbar123