regex101: date validation

?repeats the group contents below at most once:

1st AlternativeJan(?:uary)?

Janthe literal text Jan (case sensitive)

Non-Capturing Group(?:uary)?

?repeats the group contents below at most once:

uarythe literal text uary (case sensitive)

2nd AlternativeFeb(?:ruary)?

Febthe literal text Feb (case sensitive)

Non-Capturing Group(?:ruary)?

?repeats the group contents below at most once:

ruarythe literal text ruary (case sensitive)

3rd AlternativeMar(?:ch)?

Marthe literal text Mar (case sensitive)

Non-Capturing Group(?:ch)?

?repeats the group contents below at most once:

chthe literal text ch (case sensitive)

4th AlternativeApr(?:il)?

Aprthe literal text Apr (case sensitive)

Non-Capturing Group(?:il)?

?repeats the group contents below at most once:

ilthe literal text il (case sensitive)

5th AlternativeMay

Maythe literal text May (case sensitive)

6th AlternativeJun(?:e)?

Junthe literal text Jun (case sensitive)

Non-Capturing Group(?:e)?

?repeats the group contents below at most once:

ethe literal e (101₁₀ / 145₈ / 65₁₆) (case sensitive)

7th AlternativeJul(?:y)?

Julthe literal text Jul (case sensitive)

Non-Capturing Group(?:y)?

?repeats the group contents below at most once:

ythe literal y (121₁₀ / 171₈ / 79₁₆) (case sensitive)

8th AlternativeAug(?:ust)?

Augthe literal text Aug (case sensitive)

Non-Capturing Group(?:ust)?

?repeats the group contents below at most once:

ustthe literal text ust (case sensitive)

9th AlternativeSep(?:tember)?

Septhe literal text Sep (case sensitive)

Non-Capturing Group(?:tember)?

?repeats the group contents below at most once:

temberthe literal text tember (case sensitive)

10th AlternativeOct(?:ober)?

Octthe literal text Oct (case sensitive)

Non-Capturing Group(?:ober)?

?repeats the group contents below at most once:

oberthe literal text ober (case sensitive)

11th Alternative(Nov|Dec)(?:ember)?

Group 2(Nov|Dec)

1st AlternativeNov

Novthe literal text Nov (case sensitive)

2nd AlternativeDec

Decthe literal text Dec (case sensitive)

Non-Capturing Group(?:ember)?

Group 3(\s)

Group 4([1,2][\d]|[1-9]|30|31)

Group 5(\s)

Group 6(\b[\d]|10|11|12)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[0-5]

Character Class[0-9]

\sany whitespace character

Group 7(AM|PM)

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

25 tokens

Regular Expression

((?:Jan(?:uary)?|Feb(?:ruary)?|Mar(?:ch)?|Apr(?:il)?|May|Jun(?:e)?|Jul(?:y)?|Aug(?:ust)?|Sep(?:tember)?|Oct(?:ober)?|(Nov|Dec)(?:ember)?)(\s)([1,2][\d]|[1-9]|30|31)(\s))?(\b[\d]|10|11|12):[0-5][0-9]\s(AM|PM)

Unit Tests

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