Regular Expressions 101

Pro

^start of line

Group 1(\d|\d+[.,]?\d+)

1st Alternative\d

\da digit

2nd Alternative\d+[.,]?\d+

\d+a digit, repeated at least once

Character Class[.,]?

?matches at most one character from the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\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

^(\d|\d+[.,]?\d+)$

New

123
12.3
1,23
12.
.123
1...2
1.2.3.3