Regular Expressions 101

Pro

^start of line

Negative Lookahead(?!\s*$)

\s*any whitespace character, repeated any number of times

$end of line

\s*any whitespace character, repeated any number of times

Non-Capturing Group(?:(\d+)\s*h\s*)?

?repeats the group contents below at most once:

Group 1(\d+)

\d+a digit, repeated at least once

\s*any whitespace character, repeated any number of times

hthe literal h (104₁₀ / 150₈ / 68₁₆) (case sensitive)

\s*any whitespace character, repeated any number of times

Non-Capturing Group(?:(\d+)\s*m\s*)?

?repeats the group contents below at most once:

Group 2(\d+)

\d+a digit, repeated at least once

\s*any whitespace character, repeated any number of times

mthe literal m (109₁₀ / 155₈ / 6D₁₆) (case sensitive)

\s*any whitespace character, repeated any number of times

Non-Capturing Group(?:(\d+)\s*s)?

?repeats the group contents below at most once:

Group 3(\d+)

\d+a digit, repeated at least once

\s*any whitespace character, repeated any number of times

sthe literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

\s*any whitespace 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.

26 tokens

^(?!\s*$)\s*(?:(\d+)\s*h\s*)?(?:(\d+)\s*m\s*)?(?:(\d+)\s*s)?\s*$

New

11h22m33s
11h22m
11h33s
22m33s
11h
22m
33s

 11 h22  m    33  s    
11 h22 m
11 h  33 s
22 m 33 s

11h22m33s
11h22m
11h33s
22m33s
11h
22m
33s

 11 h22  m    33  s    
11 h22 m
11 h  33 s
22 m 33 s