Regular Expressions 101

Group 1(-?\d*(?:\.?\d*)?(?:e[-+]?\d*)?)

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

\d*a digit, repeated any number of times

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

?repeats the group contents below at most once:

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

\d*a digit, repeated any number of times

Non-Capturing Group(?:e[-+]?\d*)?

?repeats the group contents below at most once:

ethe literal e (101₁₀ / 145₈ / 65₁₆) (case sensitive)

Character Class[-+]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

\d*a digit, repeated any number of times

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*)?(?:e[-+]?\d*)?)

New

0.9
-.4
-0.5
9
-6
-1.0e-1
-10.56e-1
2.93847293841270e+16
-4.65981524854648e+16