Regular Expressions 101

1st Alternative\A(10(?>\.\d{1,3}){3})

\Astart of string

Group 1(10(?>\.\d{1,3}){3})

10the literal text 10

Atomic Group(?>\.\d{1,3}){3}

{3}repeats the group contents below exactly 3 times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,3}a digit, repeated between 1 and 3 times

2nd Alternative(192\.168(?>\.\d{1,3}){2})

Group 2(192\.168(?>\.\d{1,3}){2})

192the literal text 192

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

168the literal text 168

Atomic Group(?>\.\d{1,3}){2}

{2}repeats the group contents below exactly 2 times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,3}a digit, repeated between 1 and 3 times

3rd Alternative(172\.(?>1[6-9]|2\d|3[0-1])(?>\.\d{1,3}){2})\z

Group 3(172\.(?>1[6-9]|2\d|3[0-1])(?>\.\d{1,3}){2})

172the literal text 172

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Atomic Group(?>1[6-9]|2\d|3[0-1])

1st Alternative1[6-9]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[6-9]

6-9one character from 6 (54₁₀) to 9 (57₁₀)

2nd Alternative2\d

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)

Atomic Group(?>\.\d{1,3}){2}

{2}repeats the group contents below exactly 2 times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,3}a digit, repeated between 1 and 3 times

\zend of string

Global pattern flags

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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

\A(10(?>\.\d{1,3}){3})|(192\.168(?>\.\d{1,3}){2})|(172\.(?>1[6-9]|2\d|3[0-1])(?>\.\d{1,3}){2})\z

New