Regular Expressions 101

Pro

^start of line

Non-Capturing Group(?:[0-9]+(?:[.:][0-9]+)?|[.:][0-9]+)

1st Alternative[0-9]+(?:[.:][0-9]+)?

Character Class[0-9]+

+matches at least one character from the set below:

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

Non-Capturing Group(?:[.:][0-9]+)?

?repeats the group contents below at most once:

Character Class[.:]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

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

2nd Alternative[.:][0-9]+

Character Class[.:]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

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

$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

^(?:[0-9]+(?:[.:][0-9]+)?|[.:][0-9]+)$

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