Regular Expressions 101

Non-Capturing Group(?:\B#\s?)

\Bnot an ASCII word boundary

#the literal # (35₁₀ / 43₈ / 23₁₆)

\s?optionally matches any whitespace character

Group 1((\S+\s+\S+\s+\S+)|(.*?#))

1st Alternative(\S+\s+\S+\s+\S+)

Group 2(\S+\s+\S+\s+\S+)

\S+any non-whitespace character, repeated at least once

\s+any whitespace character, repeated at least once

\S+any non-whitespace character, repeated at least once

\s+any whitespace character, repeated at least once

\S+any non-whitespace character, repeated at least once

2nd Alternative(.*?#)

Group 3(.*?#)

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

#the literal # (35₁₀ / 43₈ / 23₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?:\B#\s?)((\S+\s+\S+\s+\S+)|(.*?#))

New

#test1 test2 #test3 test4 test5 #test6 test7 test8 test9 test10#test11 test12 #test13 test14 test15 test16 test17