Regular Expressions 101

Pro

^start of line

Non-Capturing Group(?:(?:\d{2}:\d{2}\-\d{2}:\d{2})(?:,(?!$))?)*

*repeats the group contents below any number of times:

Non-Capturing Group(?:\d{2}:\d{2}\-\d{2}:\d{2})

\d{2}a digit, repeated exactly 2 times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{2}a digit, repeated exactly 2 times

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{2}a digit, repeated exactly 2 times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{2}a digit, repeated exactly 2 times

Non-Capturing Group(?:,(?!$))?

?repeats the group contents below at most once:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Negative Lookahead(?!$)

$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

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25 tokens

^(?:(?:\d{2}:\d{2}\-\d{2}:\d{2})(?:,(?!$))?)*$

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