Regular Expressions 101

^start of line

Group 1(-?\d+\.?\d*E?\-?\d*)

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

\d+a digit, repeated at least once

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

\d*a digit, repeated any number of times

E?optionally matches the literal E (69₁₀ / 105₈ / 45₁₆) (case sensitive)

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

\d*a digit, repeated any number of times

$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.

Search reference

Regular Expression

^(-?\d+\.?\d*E?\-?\d*)$

New

1.34E-200
12
1E100
123.45
Hello world
-12.45E-12