Regular Expressions 101

\ban ASCII word boundary

Non-Capturing Group(?:\d{1,2}[- \/]\s?){2}

{2}repeats the group contents below exactly 2 times:

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

Character Class[- \/]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\s?optionally matches any whitespace character

Non-Capturing Group(?:\d{4}|\d{2})

1st Alternative\d{4}

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

2nd Alternative\d{2}

\d{2}a digit, repeated exactly 2 times

\ban ASCII word boundary

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

\b(?:\d{1,2}[- \/]\s?){2}(?:\d{4}|\d{2})\b

New

11/11/1111
11-11-1111
11 11 1111
11- 11- 1111
11 11 1111
11-11 1111
23- 10-17
9 06- 17
1$0%11