Regular Expressions 101

^start of line

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

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

\d*a digit, repeated any number of times

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

\d+a digit, repeated at least once

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 2(-?\d*\.?\d+)

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

\d*a digit, repeated 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.

Search reference

Regular Expression

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

1-5
1-10.1
10.5-20.5
-10.5-8
-2--1
-3.5--1
-20.5--2.1
.5-.7
-5---9
something-another