Regular Expressions 101

Explanation

Pro

Negative Lookbehind(?<!\d)

\da digit

Non-Capturing Group(?:[01]?[0-9]{1,2}|2[0-4][0-9]|25[0-5])

1st Alternative[01]?[0-9]{1,2}

Character Class[01]?

?matches at most one character from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]{1,2}

{1,2}matches between 1 and 2 characters from the set below:

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

2nd Alternative2[0-4][0-9]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-4]

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

Character Class[0-9]

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

3rd Alternative25[0-5]

25the literal text 25

Character Class[0-5]

0-5one character from 0 (48₁₀) to 5 (53₁₀)

Non-Capturing Group(?:\.(?:[01]?[0-9]{1,2}|2[0-4][0-9]|25[0-5])){3}

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:[01]?[0-9]{1,2}|2[0-4][0-9]|25[0-5])

1st Alternative[01]?[0-9]{1,2}

Character Class[01]?

?matches at most one character from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]{1,2}

{1,2}matches between 1 and 2 characters from the set below:

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

2nd Alternative2[0-4][0-9]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-4]

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

Character Class[0-9]

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

3rd Alternative25[0-5]

25the literal text 25

Character Class[0-5]

0-5one character from 0 (48₁₀) to 5 (53₁₀)

Non-Capturing Group(?::\d{1,5})?+

?+repeats the group contents below at most once:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{1,5}a digit, repeated between 1 and 5 times

Negative Lookahead(?!\d|\t*offline)

1st Alternative\d

\da digit

2nd Alternative\t*offline

\t*a tab character (ASCII 9), repeated any number of times

offlinethe literal text offline (case sensitive)

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(?<!\d)(?:[01]?[0-9]{1,2}|2[0-4][0-9]|25[0-5])(?:\.(?:[01]?[0-9]{1,2}|2[0-4][0-9]|25[0-5])){3}(?::\d{1,5})?+(?!\d|\t*offline)

New

       192.168.1.5:5555	device
        192.168.1.9:5555	offline
        192.168.1.12:5555	device
        192.168.1.13:5555	offline

Substitution

       192.168.1.5:5555	device
        192.168.1.9:5555	offline
        192.168.1.12:5555	device
        192.168.1.13:5555	offline