Regular Expressions 101

^start of line

.*any character (except for line terminators), repeated any number of times

the literal (32₁₀ / 40₈ / 20₁₆)

Group 1((?:19|20)\d{2} [A-Z]+ (?:0?[1-9]|[12]\d|3[01]) [A-Z]+)

Non-Capturing Group(?:19|20)

1st Alternative19

19the literal text 19

2nd Alternative20

20the literal text 20

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

the literal (32₁₀ / 40₈ / 20₁₆)

Character Class[A-Z]+

+matches at least one character from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

the literal (32₁₀ / 40₈ / 20₁₆)

Non-Capturing Group(?:0?[1-9]|[12]\d|3[01])

1st 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)

2nd Alternative[12]\d

Character Class[12]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

\da digit

3rd Alternative3[01]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[01]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

Character Class[A-Z]+

+matches at least one character from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

$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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Search reference

Regular Expression

^.* ((?:19|20)\d{2} [A-Z]+ (?:0?[1-9]|[12]\d|3[01]) [A-Z]+)$

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