Regular Expressions 101

Group 1(((0[1-9])|[^0]\d):)?

?repeats the group contents below at most once:

Group 2((0[1-9])|[^0]\d)

1st Alternative(0[1-9])

Group 3(0[1-9])

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

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

2nd Alternative[^0]\d

Negated Character Class[^0]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

\da digit

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[0-5]

0-5one character from 0 (48₁₀) to 5 (53₁₀)

\da digit

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[0-5]

0-5one character from 0 (48₁₀) to 5 (53₁₀)

\da digit

$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

(((0[1-9])|[^0]\d):)?[0-5]\d:[0-5]\d$

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