Regular Expressions 101

Non-Capturing Group(?:0?\d|1[0-2]|jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)

1st Alternative0?\d

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

\da digit

2nd Alternative1[0-2]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-2]

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

3rd Alternativejan

janthe literal text jan (case sensitive)

4th Alternativefeb

febthe literal text feb (case sensitive)

5th Alternativemar

marthe literal text mar (case sensitive)

6th Alternativeapr

aprthe literal text apr (case sensitive)

7th Alternativemay

maythe literal text may (case sensitive)

8th Alternativejun

junthe literal text jun (case sensitive)

9th Alternativejul

julthe literal text jul (case sensitive)

10th Alternativeaug

augthe literal text aug (case sensitive)

11th Alternativesep

septhe literal text sep (case sensitive)

12th Alternativeoct

octthe literal text oct (case sensitive)

13th Alternativenov

novthe literal text nov (case sensitive)

14th Alternativedec

decthe literal text dec (case sensitive)

Character Class[ \/-]

the literal (32₁₀ / 40₈ / 20₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:0?\d|1\d|2\d|3[0-1])

1st Alternative0?\d

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

\da digit

2nd Alternative1\d

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\da digit

3rd Alternative2\d

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

\da digit

4th Alternative3[0-1]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[0-1]

0-1one character from 0 (48₁₀) to 1 (49₁₀)

Character Class[ \/-]

the literal (32₁₀ / 40₈ / 20₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{4}a digit, repeated exactly 4 times

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?:0?\d|1[0-2]|jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)[ \/-](?:0?\d|1\d|2\d|3[0-1])[ \/-]\d{4}

New

1/1/1987 09-21-2018 mar 8 1969 7 17 1975

Regular Expression

Substitution