regex101: PCRE2 (PHP) Match Workspace

Pro

^start of line

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

Negative Lookahead(?!.*\d[,.]\d.*\d)

.*any character (except for line terminators), repeated any number of times

\da digit

Character Class[,.]

,the literal , (44₁₀ / 54₈ / 2C₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\da digit

.*any character (except for line terminators), repeated any number of times

\da digit

Negative Lookahead(?!$)

$end of line

Group 1(\d+(?:[,.]\d+)?Y)?

?repeats the group contents below at most once:

\d+a digit, repeated at least once

Non-Capturing Group(?:[,.]\d+)?

?repeats the group contents below at most once:

Character Class[,.]

,the literal , (44₁₀ / 54₈ / 2C₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

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

Group 2(\d+(?:[,.]\d+)?M)?

?repeats the group contents below at most once:

\d+a digit, repeated at least once

Non-Capturing Group(?:[,.]\d+)?

?repeats the group contents below at most once:

Character Class[,.]

,the literal , (44₁₀ / 54₈ / 2C₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

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

Group 3(\d+(?:[,.]\d+)?W)?

?repeats the group contents below at most once:

\d+a digit, repeated at least once

Non-Capturing Group(?:[,.]\d+)?

?repeats the group contents below at most once:

Character Class[,.]

,the literal , (44₁₀ / 54₈ / 2C₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

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

Group 4(\d+(?:[,.]\d+)?D)?

?repeats the group contents below at most once:

\d+a digit, repeated at least once

Non-Capturing Group(?:[,.]\d+)?

?repeats the group contents below at most once:

Character Class[,.]

,the literal , (44₁₀ / 54₈ / 2C₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

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

Group 5(T(?=\d)(\d+(?:[,.]\d+)?H)?(\d+(?:[,.]\d+)?M)?(\d+(?:[,.]\d+)?S)?)?

?repeats the group contents below at most once:

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

Positive Lookahead(?=\d)

\da digit

Group 6(\d+(?:[,.]\d+)?H)?

?repeats the group contents below at most once:

\d+a digit, repeated at least once

Non-Capturing Group(?:[,.]\d+)?

?repeats the group contents below at most once:

Character Class[,.]

,the literal , (44₁₀ / 54₈ / 2C₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

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

Group 7(\d+(?:[,.]\d+)?M)?

?repeats the group contents below at most once:

\d+a digit, repeated at least once

Non-Capturing Group(?:[,.]\d+)?

?repeats the group contents below at most once:

Character Class[,.]

,the literal , (44₁₀ / 54₈ / 2C₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

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

Group 8(\d+(?:[,.]\d+)?S)?

?repeats the group contents below at most once:

\d+a digit, repeated at least once

Non-Capturing Group(?:[,.]\d+)?

?repeats the group contents below at most once:

Character Class[,.]

\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

25 tokens

Regular Expression

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

New

P1DT1.5H

P1.5DT1H
 is not a valid duration, as the hours are the smallest supplied unit.
P1.5DT1.5H
 would also not be valid.

Substitution

P1DT1.5H

P1.5DT1H
 is not a valid duration, as the hours are the smallest supplied unit.
P1.5DT1.5H
 would also not be valid.