Regular Expressions 101

Negative Lookbehind(?<!\d:)

\da Unicode decimal digit

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Negative Lookbehind(?<!\d)

\da Unicode decimal digit

Character Class[0-5]?

?matches at most one character from the set below:

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

\da Unicode decimal digit

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[0-5]

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

\da Unicode decimal digit

Negative Lookahead(?!:?\d)

:?optionally matches the literal : (58₁₀ / 72₈ / 3A₁₆)

\da Unicode decimal digit

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

(?<!\d:)(?<!\d)[0-5]?\d:[0-5]\d(?!:?\d)

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