Regular Expressions 101

Group 1(0[1-9]|[12]\d|3[0-1])

1st Alternative0[1-9]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

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

2nd Alternative[12]\d

Character Class[12]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

\da digit

3rd 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 . (46₁₀ / 56₈ / 2E₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

1st Alternative[0[1-9]

Character Class[0[1-9]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

[the literal [ (91₁₀ / 133₈ / 5B₁₆)

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)

Character Class[\./]

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 3(196[1-9]|19[7-9]\d|20\d\d|2100)

1st Alternative196[1-9]

196the literal text 196

Character Class[1-9]

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

2nd Alternative19[7-9]\d

19the literal text 19

Character Class[7-9]

7-9one character from 7 (55₁₀) to 9 (57₁₀)

\da digit

3rd Alternative20\d\d

20the literal text 20

\da digit

4th Alternative2100

2100the literal text 2100

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[1-9]|[12]\d|3[0-1])[\./]([0[1-9]|1[0-2])[\./](196[1-9]|19[7-9]\d|20\d\d|2100)

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