Regular Expressions 101

1st Alternative-?\d+(?:\.\d+)?

-?optionally matches the literal - (45₁₀ / 55₈ / 2D₁₆)

\d+a digit, repeated at least once

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

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

2nd Alternative\+?(?:\d+(?:\.\d+)?|\.\d+)

\+?optionally matches the literal + (43₁₀ / 53₈ / 2B₁₆)

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

1st Alternative\d+(?:\.\d+)?

\d+a digit, repeated at least once

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

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

2nd Alternative\.\d+

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

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

Regular Expression

-?\d+(?:\.\d+)?|\+?(?:\d+(?:\.\d+)?|\.\d+)

New

+3.14
3
3.0
+45
-34
-4.35
.5
.50
-.5
+.5