Regular Expressions 101

^start of line

\d+a digit, repeated at least once

Non-Capturing Group(?:\.[a-zA-Z]?\d+)*

*repeats the group contents below any number of times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-zA-Z]?

?matches at most one character from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

\d+a digit, 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

^\d+(?:\.[a-zA-Z]?\d+)*$

New

123.123.123.132
123123213123
123.a123.b123.123
123.aa1.bb12