Regular Expressions 101

Pro

^start of line

Negative Lookahead(?!$)

$end of line

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

?repeats the group contents below at most once:

Group 1(\d+)

\d+a digit, repeated at least once

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

\h*any horizontal whitespace character, repeated any number of times

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

?repeats the group contents below at most once:

Group 2(\d+)

\d+a digit, repeated at least once

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

$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

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

New

1h 31m
45m
1h 42m
2h

1h 31m
45m
1h 42m
2h