Regular Expressions 101

Pro

^start of line

Non-Capturing Group(?:1[0-4]|[0-9])

1st Alternative1[0-4]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-4]

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

2nd Alternative[0-9]

Character Class[0-9]

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

Non-Capturing Group(?:\.\d+)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\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

^(?:1[0-4]|[0-9])(?:\.\d+)?$

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