Regular Expressions 101

Pro

Negative Lookbehind(?<![\d/])

Character Class[\d/]

\da Unicode decimal digit

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:0[1-9]|1[0-2])

1st Alternative0[1-9]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

2nd Alternative1[0-2]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-2]

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

/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

Negative Lookahead(?![\d/])

Character Class[\d/]

\da Unicode decimal digit

/the literal / (47₁₀ / 57₈ / 2F₁₆)

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.

25 tokens

(?<![\d/])(?:0[1-9]|1[0-2])/\d{4}(?![\d/])

New

06/2000
abc06/2000def
abc 06/2000 def
02/06/2000
02-06/2000
206/2000
13/2000
12/200
00/2000

06/2000
abc06/2000def
abc 06/2000 def
02/06/2000
02-06/2000
206/2000
13/2000
12/200
00/2000