Regular Expressions 101

Character Class[0-9]{2}

{2}matches exactly 2 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Character Class[0-9]{2}

{2}matches exactly 2 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Character Class[0-9]{4}

{4}matches exactly 4 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

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

[0-9]{2}\/[0-9]{2}\/[0-9]{4}

Test String
New

Valid dates:

01/04/2020
20/01/2019
25/12/1950
30/07/2021
31/08/1919
01/01/1729
10/05/2000
15/10/2049

Invalid dates:

001/04/1900
01/004/1900
90/04/1900
33/04/1900
01/13/1900
01/04/19000
00/04/1900
01/00/1900
1/4/00
1/04/1900
10/4/1900
10/04/00
///
/04/1900
01//1900
01/04/
01/04/1900
This is the date: 01/04/1900
01.04.1900
01-04-1900

Regular Expression

Test StringNew

SubstitutionProcessing...

Test String
New

Substitution
Processing...