Regular Expressions 101

Pro

^start of line

Character Class[\w\h.]+

+matches at least one character from the set below:

\wany word character

\hany horizontal whitespace character

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:(?::\d*){1,3}(?::\w*(?::\w+(?:\.\w+)*)?)?)?

?repeats the group contents below at most once:

Non-Capturing Group(?::\d*){1,3}

{1,3}repeats the group contents below between 1 and 3 times:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d*a digit, repeated any number of times

Non-Capturing Group(?::\w*(?::\w+(?:\.\w+)*)?)?

?repeats the group contents below at most once:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\w*any word character, repeated any number of times

Non-Capturing Group(?::\w+(?:\.\w+)*)?

?repeats the group contents below at most once:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\w+any word character, repeated at least once

Non-Capturing Group(?:\.\w+)*

*repeats the group contents below any number of times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\w+any word character, repeated at least once

$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

Regular Expression

^[\w\h.]+(?:(?::\d*){1,3}(?::\w*(?::\w+(?:\.\w+)*)?)?)?$

New

Alphanumerictext1
Alphanumerictext1:1234
Alphanumerictext1:1234:12
Alphanumerictext1:1234::124:aplhnumericText2
Alphanumerictext1::12
Alphanumerictext1:1234:12:124:aplhnumericText2:www.stackoverflow.com