Regular Expressions 101

^start of line

Character Class[+-]?

?matches at most one character from the set below:

+the literal + (43₁₀ / 53₈ / 2B₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:\d+|\d{1,3}(?:,\d{3})*)

1st Alternative\d+

\d+a digit, repeated at least once

2nd Alternative\d{1,3}(?:,\d{3})*

\d{1,3}a digit, repeated between 1 and 3 times

Non-Capturing Group(?:,\d{3})*

*repeats the group contents below any number of times:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\d{3}a digit, repeated exactly 3 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.

Search reference

Regular Expression

^[+-]?(?:\d+|\d{1,3}(?:,\d{3})*)(?:\.\d*)?$

New

10000
100,000,000
100,000,000.345345
10000.689
10000000.56
10000000

123,344.456
1234556
123456.124
-1234
-123,456,789
+1234.67

10000,000,000.34534