Regular Expressions 101

^start of line

Group sign(?<sign>[+-])?

?repeats the group contents below at most once:

Character Class[+-]

+the literal + (43₁₀ / 53₈ / 2B₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d+a digit, repeated at least once

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

?repeats the group contents below at most once:

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

\d+a digit, repeated at least once

Group percent(?<percent>%)?

?repeats the group contents below at most once:

%the literal % (37₁₀ / 45₈ / 25₁₆)

$end of line

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(?<sign>[+-])?\d+(?:\.?\d+)?(?<percent>%)?$

New

50
-50
+50
50%
+50%
-50%
50.50.50
+-50%
-50.%
4.%