Regular Expressions 101

1st Alternative^([0-1]\d:[0-5]\d)

^start of line

Group 1([0-1]\d:[0-5]\d)

Character Class[0-1]

0-1one character from 0 (48₁₀) to 1 (49₁₀)

\da digit

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[0-5]

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

\da digit

2nd Alternative(^20:0[0-5])

Group 2(^20:0[0-5])

^start of line

20:0the literal text 20:0

Character Class[0-5]

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

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^([0-1]\d:[0-5]\d)|(^20:0[0-5])

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12:35 midday (all days of week)
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19:35 evening (sun-fri)
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20:05 evening (saturday)
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