Regular Expressions 101

Pro

^start of line

Negative Lookahead(?!\D+$)

\D+any character that's not a digit, repeated at least once

$end of line

\+?optionally matches the literal + (43₁₀ / 53₈ / 2B₁₆)

\d*?a digit, repeated any number of times

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

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\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.

25 tokens

^(?!\D+$)\+?\d*?(?:\.\d*)?$

New


1.
0
+35.
+.
+
0.35
000
.123
00100
.
-100


1.
0
+35.
+.
+
0.35
000
.123
00100
.
-100