Regular Expressions 101

Explanation

Pro

1st Alternative([1-9][0-9]{0,8})

Group 1([1-9][0-9]{0,8})

Character Class[1-9]

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

Character Class[0-9]{0,8}

{0,8}matches between 0 and 8 characters from the set below:

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

2nd Alternative([12][01][0-4][0-7][0-4][0-8][0-3][0-6][0-4][0-7])

Group 2([12][01][0-4][0-7][0-4][0-8][0-3][0-6][0-4][0-7])

Character Class[12]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[01]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-4]

0-4one character from 0 (48₁₀) to 4 (52₁₀)

Character Class[0-7]

0-7one character from 0 (48₁₀) to 7 (55₁₀)

Character Class[0-4]

0-4one character from 0 (48₁₀) to 4 (52₁₀)

Character Class[0-8]

0-8one character from 0 (48₁₀) to 8 (56₁₀)

Character Class[0-3]

0-3one character from 0 (48₁₀) to 3 (51₁₀)

Character Class[0-6]

0-6one character from 0 (48₁₀) to 6 (54₁₀)

Character Class[0-4]

0-4one character from 0 (48₁₀) to 4 (52₁₀)

Character Class[0-7]

0-7one character from 0 (48₁₀) to 7 (55₁₀)

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

([1-9][0-9]{0,8})|([12][01][0-4][0-7][0-4][0-8][0-3][0-6][0-4][0-7])

4809238
1
2147483647

4809238
1
2147483647