Regular Expressions 101

Pro

^start of line

Negative Lookahead(?!(([^:]*?\.){3,}))

Group 1(([^:]*?\.){3,})

Group 2([^:]*?\.){3,}

{3,}repeats the group contents below at least 3 times:

Negated Character Class[^:]*?

*?matches any number of characters outside the set below:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 3(.*?)

.*?any Unicode character (except for line terminators), repeated any number of times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Group 4(.*)

.*any Unicode character (except for line terminators), repeated any number of times

$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

^(?!(([^:]*?\.){3,}))(.*?):(.*)$

New

1.2.3.4.:5.6.7.8.:9.
11.2.:4.5.6:.
21.:2.3.4.5.6:.7
31:.2.3.4.5.6:.7
51.52.53.54:55.56.:57

1.2.3.4.:5.6.7.8.:9.
11.2.:4.5.6:.
21.:2.3.4.5.6:.7
31:.2.3.4.5.6:.7
51.52.53.54:55.56.:57