regex101: PCRE (Legacy) Match Workspace

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

\da digit

Character Class[- \/.]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negative Lookbehind(?<!\d)

\da digit

Group 1(3[01]|[12][0-9]|0?[1-9])

1st Alternative3[01]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[01]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2nd Alternative[12][0-9]

Character Class[12]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-9]

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

3rd Alternative0?[1-9]

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

Character Class[1-9]

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

Character Class[- \/.]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2(1[012]|0?[1-9])

1st Alternative1[012]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[012]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

2nd Alternative0?[1-9]

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

Character Class[1-9]

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

Character Class[- \/.]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

?repeats the group contents below at most once:

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

Group 3(\d?\d)

\d?optionally matches a digit

\da digit

Negative Lookahead(?![- \/.]?\d)

Character Class[- \/.]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\da digit

Global pattern flags

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

25 tokens

Regular Expression

(?<!\d[- \/.])(?<!\d)(3[01]|[12][0-9]|0?[1-9])[- \/.](1[012]|0?[1-9])[- \/.](?:\d{2})?(\d?\d)(?![- \/.]?\d)

Unit Tests

There are no unit tests, click to add some.