Regular Expressions 101

^start of line

PTthe literal text PT (case sensitive)

Group 1(\d+H)?

?repeats the group contents below at most once:

\d+a digit, repeated at least once

Hthe literal H (72₁₀ / 110₈ / 48₁₆) (case sensitive)

Group 2(\d+M)?

?repeats the group contents below at most once:

\d+a digit, repeated at least once

Mthe literal M (77₁₀ / 115₈ / 4D₁₆) (case sensitive)

Group 3(\d+S)?

?repeats the group contents below at most once:

\d+a digit, repeated at least once

Sthe literal S (83₁₀ / 123₈ / 53₁₆) (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.

Search reference

Regular Expression

^PT(\d+H)?(\d+M)?(\d+S)?$

New

PT1H37S
PT1H30M15S
PT0S
PT1H0M0S
PT22H41M59S