Regular Expressions 101

1st Alternative(^(?:\d)\.\d*)

Group 1(^(?:\d)\.\d*)

^start of line

Non-Capturing Group(?:\d)

\da digit

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d*a digit, repeated any number of times

2nd Alternative(10\.?0*$)

Group 2(10\.?0*$)

10the literal text 10

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

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.

Search reference

Regular Expression

(^(?:\d)\.\d*)|(10\.?0*$)

New


Valid numbers
0.23
1.02
6.2
7.20
10.00
10
5.656563211235435454643234656563211235435454643234656563211235435454643234656563211235435454643234

Invalid numbers:
10.01
12.333
 5.656563211235435454643234656563211235435454643234656563211235435454643234656563211235435454643234

Regular Expression

Extraction