Regular Expressions 101

Explanation

Pro

1st Alternative(Jan(?:uary)?|Feb(?:ruary)?|Mar(?:ch)?|Apr(?:il)?|May|June?|July?|Aug(?:ust)?|Sep(?:tember)?|Oct(?:ober)?|Nov(?:ember)?|Dec(?:ember)?)\s(\d\d?)(st|nd|rd|th)?,?\s(\d{4})

Group 1(Jan(?:uary)?|Feb(?:ruary)?|Mar(?:ch)?|Apr(?:il)?|May|June?|July?|Aug(?:ust)?|Sep(?:tember)?|Oct(?:ober)?|Nov(?:ember)?|Dec(?:ember)?)

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 AlternativeJune?

Junthe literal text Jun (case sensitive)

e?optionally matches the literal e (101₁₀ / 145₈ / 65₁₆) (case sensitive)

7th AlternativeJuly?

Julthe literal text Jul (case sensitive)

y?optionally matches the 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 AlternativeNov(?:ember)?

Novthe literal text Nov (case sensitive)

Non-Capturing Group(?:ember)?

?repeats the group contents below at most once:

emberthe literal text ember (case sensitive)

12th AlternativeDec(?:ember)?

Decthe literal text Dec (case sensitive)

Non-Capturing Group(?:ember)?

?repeats the group contents below at most once:

emberthe literal text ember (case sensitive)

\sany whitespace character

Group 2(\d\d?)

\da digit

\d?optionally matches a digit

Group 3(st|nd|rd|th)?

?repeats the group contents below at most once:

1st Alternativest

2nd Alternativend

3rd Alternativerd

4th Alternativeth

,?optionally matches the literal , (44₁₀ / 54₈ / 2C₁₆)

\sany whitespace character

Group 4(\d{4})

2nd Alternative(\d\d?)[\.\/-](\d\d?)[\.\/-](\d{4})

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(Jan(?:uary)?|Feb(?:ruary)?|Mar(?:ch)?|Apr(?:il)?|May|June?|July?|Aug(?:ust)?|Sep(?:tember)?|Oct(?:ober)?|Nov(?:ember)?|Dec(?:ember)?)\s(\d\d?)(st|nd|rd|th)?,?\s(\d{4})|(\d\d?)[\.\/-](\d\d?)[\.\/-](\d{4})

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07/27/1998
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Jul 23rd 2022
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February 16th 1998
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May 29th, 2006
02-19-2005
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