Regular Expressions 101

^start of line

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

*repeats the group contents below any number of times:

Character Class[+]?

?matches at most one character from the set below:

+the literal + (43₁₀ / 53₈ / 2B₁₆)

\d+a digit, repeated at least once

Group 2(\.\d+)?

?repeats the group contents below at most once:

\.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+)?)*$

1+2
1.2+56+3.5
1++2
1.2.+34+83