Regular Expressions 101

Explanation
Pro

^start of string

Pthe literal P (80₁₀ / 120₈ / 50₁₆) (case sensitive)

Group 1((?P<year>\d+)Y)?

?repeats the group contents below at most once:

Group year(?P<year>\d+)

\d+a digit, repeated at least once

Ythe literal Y (89₁₀ / 131₈ / 59₁₆) (case sensitive)

Group 3((?P<month>\d+)M)?

?repeats the group contents below at most once:

Group month(?P<month>\d+)

\d+a digit, repeated at least once

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

Group 5((?P<day>\d+)D)?

?repeats the group contents below at most once:

Group day(?P<day>\d+)

\d+a digit, repeated at least once

Dthe literal D (68₁₀ / 104₈ / 44₁₆) (case sensitive)

Group 7(T((?P<hour>\d+)H)?((?P<minute>\d+)M)?((?P<second>\d+)S)?)?

?repeats the group contents below at most once:

Tthe literal T (84₁₀ / 124₈ / 54₁₆) (case sensitive)

Group 8((?P<hour>\d+)H)?

?repeats the group contents below at most once:

Group hour(?P<hour>\d+)

\d+a digit, repeated at least once

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

Group 10((?P<minute>\d+)M)?

?repeats the group contents below at most once:

Group minute(?P<minute>\d+)

\d+a digit, repeated at least once

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

Group 12((?P<second>\d+)S)?

?repeats the group contents below at most once:

Group second(?P<second>\d+)

\d+a digit, repeated at least once

Sthe literal S (83₁₀ / 123₈ / 53₁₆) (case sensitive)

$end of string

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25 tokens

^P((?P<year>\d+)Y)?((?P<month>\d+)M)?((?P<day>\d+)D)?(T((?P<hour>\d+)H)?((?P<minute>\d+)M)?((?P<second>\d+)S)?)?$

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