Regular Expressions 101

^start of line

\$?optionally matches the literal $ (36₁₀ / 44₈ / 24₁₆)

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

1st Alternative\d+

\d+a Unicode decimal digit, repeated at least once

2nd Alternative\d*\.\d+

\d*a Unicode decimal digit, repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a Unicode decimal digit, repeated at least once

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

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

?repeats the group contents below at most once:

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

,the literal , (44₁₀ / 54₈ / 2C₁₆)

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

*repeats the group contents below any number of times:

\d{3}a Unicode decimal digit, repeated exactly 3 times

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\d{3}a Unicode decimal digit, repeated exactly 3 times

4th Alternative(?:\d{1,3},)?(?:\d{3},)*\d{3}\.\d+

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

?repeats the group contents below at most once:

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

,the literal , (44₁₀ / 54₈ / 2C₁₆)

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

*repeats the group contents below any number of times:

\d{3}a Unicode decimal digit, repeated exactly 3 times

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\d{3}a Unicode decimal digit, repeated exactly 3 times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a Unicode decimal digit, repeated at least once

$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

u modifier: unicode. Treats the pattern and subject as UTF-16

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

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

New

1
123
1234567
1234567890
1,234
123,456
1,234,567
1,234,567,890
$1
$123
$1234567.890
$1234567890
$1,234
$123,456
$1,234,567
1.0
123.0
1234567.0
1,234.0
123,456.0
1,234,567.0
$1.0
$123.0
$123456.0
$1,234.0
$123,456.0
$1,234,567.987
.0
$.0
.01
$.02

  1 12
1,23
1,234567
$
$,0
$1,0
1.1.1
1.
.
1,1
,1
1,1.0
1.1,0
,