Regular Expressions 101

^start of line

Group 1(\d+\.?\d+|\d)

1st Alternative\d+\.?\d+

\d+a digit, repeated at least once

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

2nd Alternative\d

\da digit

$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.

Search reference

Regular Expression

^(\d+\.?\d+|\d)$

New

123.321
123..123
1.2.3.4
123.333.123
12389329
1
.123
123.