Regular Expressions 101

Pro

^start of line

Character Class[+-]?

?matches at most one character from the set below:

+the literal + (43₁₀ / 53₈ / 2B₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d+a Unicode decimal digit, repeated at least once

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

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a Unicode decimal 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+)?$

New

+0.0
0.0
-00.00
-000.000
10
5
-7.9
-10.88765444
-1234566.86654432
12355.79795763649

10..2
++1231
--99.0
--444..555
.99
7.
888888...4
984hb7822

+0.0
0.0
-00.00
-000.000
10
5
-7.9
-10.88765444
-1234566.86654432
12355.79795763649

10..2
++1231
--99.0
--444..555
.99
7.
888888...4
984hb7822