Regular Expressions 101

Pro

^start of line

\d+a digit, repeated at least once

Group 1(\.?\d+)*

*repeats the group contents below any number of times:

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

\d+a 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

111111111d
(Try adding 1 before the d; every digit will double the execution time - exponential growth. This is BAD!)

111111111d
(Try adding 1 before the d; every digit will double the execution time - exponential growth. This is BAD!)