Regular Expressions 101

Explanation

Pro

Non-Capturing Group(?:\b\d{1,2}\D{0,3})?

?repeats the group contents below at most once:

\ba Unicode word boundary

\d{1,2}a Unicode decimal digit, repeated between 1 and 2 times

\D{0,3}any character that is not a Unicode decimal digit, repeated between 0 and 3 times

\ba Unicode word boundary

Non-Capturing Group(?:Jan(?:uary)?|Feb(?:ruary)?|Mar(?:ch)?|Apr(?:il)?|May|Jun(?:e)?|Jul(?:y)?|Aug(?:ust)?|Sep(?:tember)?|Oct(?:ober)?|(?:Nov|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 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)?

Non-Capturing Group(?:Nov|Dec)

1st AlternativeNov

Novthe literal text Nov (case sensitive)

2nd AlternativeDec

Decthe literal text Dec (case sensitive)

Non-Capturing Group(?:ember)?

\D?optionally matches any character that is not a Unicode decimal digit

Non-Capturing Group(?:\d{1,2}\D?)?

\D?optionally matches any character that is not a Unicode decimal digit

Non-Capturing Group(?:(?:19[7-9]\d|20\d{2})|\d{2})

Slide the literal text Slide (case sensitive)

\d+a Unicode decimal digit, repeated at least once

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

(?:\b\d{1,2}\D{0,3})?\b(?:Jan(?:uary)?|Feb(?:ruary)?|Mar(?:ch)?|Apr(?:il)?|May|Jun(?:e)?|Jul(?:y)?|Aug(?:ust)?|Sep(?:tember)?|Oct(?:ober)?|(?:Nov|Dec)(?:ember)?)\D?(?:\d{1,2}\D?)?\D?(?:(?:19[7-9]\d|20\d{2})|\d{2}) Slide \d+

New

Filling a gap December 6, 2018 Slide 6 Small parts example. Padded details May 22, 2020 Slide 21 Adds to safety

Substitution

.

Filling a gap December 6, 2018 Slide 6 Small parts example. Padded details May 22, 2020 Slide 21 Adds to safety