Regular Expressions 101

Explanation

Pro

\ba Unicode word boundary

Group 1((?:1[0-2]|0?[1-9]):[0-5][0-9]\s?(?:AM|PM|am|pm))

Non-Capturing Group(?:1[0-2]|0?[1-9])

1st Alternative1[0-2]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-2]

0-2one character from 0 (48₁₀) to 2 (50₁₀)

2nd Alternative0?[1-9]

0?optionally matches the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

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

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[0-5]

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

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\s?optionally matches a Unicode whitespace character

Non-Capturing Group(?:AM|PM|am|pm)

1st AlternativeAM

AMthe literal text AM (case sensitive)

2nd AlternativePM

PMthe literal text PM (case sensitive)

3rd Alternativeam

amthe literal text am (case sensitive)

4th Alternativepm

pmthe literal text pm (case sensitive)

\r?optionally matches a carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

Group 2([F1]?)

Character Class[F1]?

?matches at most one character from the set below:

Fthe literal F (70₁₀ / 106₈ / 46₁₆) (case sensitive)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

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

No unit tests

Add a test to get started

25 tokens

\b((?:1[0-2]|0?[1-9]):[0-5][0-9]\s?(?:AM|PM|am|pm))\r?\n([F1]?)

There are no unit tests.