regex101: ISO 8601 Duration Regex

^start of line

Group 1(P((?<numYears>[1-9]+[0-9]*)Y)?((?<numMonths>[1-9]+[0-9]*)M)?((?<numDays>[1-9]+[0-9]*)D)?(T((?<numHours>[1-9]+[0-9]*)H)?((?<numMinutes>[1-9]+[0-9]*)M)?((?<numSeconds>[1-9]+[0-9]*)S)?)?|P(?<numWeeks>[1-9]+[0-9]*)W)

1st AlternativeP((?<numYears>[1-9]+[0-9]*)Y)?((?<numMonths>[1-9]+[0-9]*)M)?((?<numDays>[1-9]+[0-9]*)D)?(T((?<numHours>[1-9]+[0-9]*)H)?((?<numMinutes>[1-9]+[0-9]*)M)?((?<numSeconds>[1-9]+[0-9]*)S)?)?

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

Group 2((?<numYears>[1-9]+[0-9]*)Y)?

?repeats the group contents below at most once:

Group numYears(?<numYears>[1-9]+[0-9]*)

Character Class[1-9]+

+matches at least one character from the set below:

1-9one character from 1 (49₁₀) to 9 (57₁₀)

Character Class[0-9]*

*matches any number of characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

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

Group 4((?<numMonths>[1-9]+[0-9]*)M)?

?repeats the group contents below at most once:

Group numMonths(?<numMonths>[1-9]+[0-9]*)

Character Class[1-9]+

+matches at least one character from the set below:

1-9one character from 1 (49₁₀) to 9 (57₁₀)

Character Class[0-9]*

*matches any number of characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

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

Group 6((?<numDays>[1-9]+[0-9]*)D)?

?repeats the group contents below at most once:

Group numDays(?<numDays>[1-9]+[0-9]*)

Character Class[1-9]+

+matches at least one character from the set below:

1-9one character from 1 (49₁₀) to 9 (57₁₀)

Character Class[0-9]*

*matches any number of characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

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

Group 8(T((?<numHours>[1-9]+[0-9]*)H)?((?<numMinutes>[1-9]+[0-9]*)M)?((?<numSeconds>[1-9]+[0-9]*)S)?)?

?repeats the group contents below at most once:

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

Group 9((?<numHours>[1-9]+[0-9]*)H)?

?repeats the group contents below at most once:

Group numHours(?<numHours>[1-9]+[0-9]*)

Character Class[1-9]+

+matches at least one character from the set below:

1-9one character from 1 (49₁₀) to 9 (57₁₀)

Character Class[0-9]*

*matches any number of characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

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

Group 11((?<numMinutes>[1-9]+[0-9]*)M)?

?repeats the group contents below at most once:

Group numMinutes(?<numMinutes>[1-9]+[0-9]*)

Character Class[1-9]+

+matches at least one character from the set below:

1-9one character from 1 (49₁₀) to 9 (57₁₀)

Character Class[0-9]*

*matches any number of characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

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

Group 13((?<numSeconds>[1-9]+[0-9]*)S)?

?repeats the group contents below at most once:

Group numSeconds(?<numSeconds>[1-9]+[0-9]*)

Character Class[1-9]+

Character Class[0-9]*

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

2nd AlternativeP(?<numWeeks>[1-9]+[0-9]*)W

$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

Search reference

Regular Expression

^(P((?<numYears>[1-9]+[0-9]*)Y)?((?<numMonths>[1-9]+[0-9]*)M)?((?<numDays>[1-9]+[0-9]*)D)?(T((?<numHours>[1-9]+[0-9]*)H)?((?<numMinutes>[1-9]+[0-9]*)M)?((?<numSeconds>[1-9]+[0-9]*)S)?)?|P(?<numWeeks>[1-9]+[0-9]*)W)$

New

P1Y2M3DT4H5M6S
P1M
PT1M
P1MT1M
P1W
P1D
PT2S