Regular Expressions 101

Pro

^start of line

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

1st Alternative(0[1-9]|1[0-2])

Group 2(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)

2nd Alternative([1-9]{1})

Group 3([1-9]{1})

Character Class[1-9]{1}

{1}matches one character from the set below:

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

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 4([0-9]{4}|[0-9]{2})

1st Alternative[0-9]{4}

Character Class[0-9]{4}

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

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

2nd Alternative[0-9]{2}

Character Class[0-9]{2}

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

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

$end of line

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

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

Detailed match information will be displayed here automatically.

26 tokens

^((0[1-9]|1[0-2])|([1-9]{1}))\/([0-9]{4}|[0-9]{2})$

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