Regular Expressions 101

Pro

^start of line

123the literal text 123

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

45the literal text 45

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

116the literal text 116

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 1([0-9]|[0-1][0-9]|2[0-4])

1st Alternative[0-9]

Character Class[0-9]

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

2nd Alternative[0-1][0-9]

Character Class[0-1]

0-1one character from 0 (48₁₀) to 1 (49₁₀)

Character Class[0-9]

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

3rd Alternative2[0-4]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-4]

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

$end of line

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

^123\.45\.116\.([0-9]|[0-1][0-9]|2[0-4])$

New

123.45.116.0
123.45.116.1
123.45.116.25
123.45.116.24

123.45.116.0
123.45.116.1
123.45.116.25
123.45.116.24