Regular Expressions 101

^start of line

Group 1(\-{0,1})

\-{0,1}optionally matches the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:(?:0*)(\d+))?

?repeats the group contents below at most once:

Non-Capturing Group(?:0*)

0*the literal 0 (48₁₀ / 60₈ / 30₁₆) , repeated any number of times

Group 2(\d+)

\d+a digit, repeated at least once

Group 3((?:\.)(?:\d*?))?

?repeats the group contents below at most once:

Non-Capturing Group(?:\.)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

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

0*the literal 0 (48₁₀ / 60₈ / 30₁₆) , 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

Regular Expression

^(\-{0,1})(?:(?:0*)(\d+))?((?:\.)(?:\d*?))?0*$

New

-0.002506000
1
01
10
1.25
01.250
0
0002345000
0.25
0.50
0.5
0.75000
1000
0001.111
0001.5
.25
01234
-00.1
.2500
.0256
-.010