Regular Expressions 101

Explanation

Pro

^start of line

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

Group 1(0*[1-9]\d*(?:[\., ]\d+)*)

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

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\d*a digit, repeated any number of times

Non-Capturing Group(?:[\., ]\d+)*

*repeats the group contents below any number of times:

Character Class[\., ]

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

\d+a digit, repeated at least once

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

Non-Capturing Group(?:\p{Sc}|°[FC])?

?repeats the group contents below at most once:

1st Alternative\p{Sc}

\p{Sc}any currency sign

2nd Alternative°[FC]

°the literal ° (176₁₀ / 260₈ / B0₁₆)

Character Class[FC]

Fthe literal F (70₁₀ / 106₈ / 46₁₆) (case sensitive)

Cthe literal C (67₁₀ / 103₈ / 43₁₆) (case sensitive)

$end of line

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

g modifier: global. Finds all matches instead of stopping after the first

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

^\+?(0*[1-9]\d*(?:[\., ]\d+)*) *(?:\p{Sc}|°[FC])?$

New

All real numbers can be divided into three categories: positive, negative and zero;
Match all positive number

Match:
2
9 
+8
005
0420
123456789
40.262,12
+042 262,12
421.265.195,52
0420 $
0420 €
35 °C
12 °F

No Match:
0
00000 0000
-10
-1
10a