Regular Expressions 101

^start of line

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

Negative Lookahead(?!$)

$end of line

Group 1(\d+Y)?

?repeats the group contents below at most once:

\d+a digit, repeated at least once

Ythe literal Y (89₁₀ / 131₈ / 59₁₆) (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+W)?

?repeats the group contents below at most once:

\d+a digit, repeated at least once

Wthe literal W (87₁₀ / 127₈ / 57₁₆) (case sensitive)

Group 4(\d+D)?

?repeats the group contents below at most once:

\d+a digit, repeated at least once

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

Group 5(T(?=\d+[HMS])(\d+H)?(\d+M)?(\d+S)?)?

?repeats the group contents below at most once:

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

Positive Lookahead(?=\d+[HMS])

\d+a digit, repeated at least once

Character Class[HMS]

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

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

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

Group 6(\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 7(\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 8(\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.

25 tokens

Regular Expression

^P(?!$)(\d+Y)?(\d+M)?(\d+W)?(\d+D)?(T(?=\d+[HMS])(\d+H)?(\d+M)?(\d+S)?)?$

New

P1Y
P2MT30M
PT6H
P5W

P
PT
P3MT

Extraction

P1Y
P2MT30M
PT6H
P5W

P
PT
P3MT