Regular Expressions 101

^start of line

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

Group 1([0-9]{1,3},([0-9]{3},)*[0-9]{3}|[0-9]+)

1st Alternative[0-9]{1,3},([0-9]{3},)*[0-9]{3}

Character Class[0-9]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Group 2([0-9]{3},)*

*repeats the group contents below any number of times:

Character Class[0-9]{3}

{3}matches exactly 3 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Character Class[0-9]{3}

{3}matches exactly 3 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

2nd Alternative[0-9]+

Character Class[0-9]+

+matches at least one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Group 3(\.[0-9][0-9])?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

$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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^\$?([0-9]{1,3},([0-9]{3},)*[0-9]{3}|[0-9]+)(\.[0-9][0-9])?$

Test String
New

$500
$5,00
$5,000
$5.0
$5.
$5.00
$5.000
$5,.5
500
5,000
5,00
5,0
5.0
5.00
5.000
5.23
2.342
$5,5,5
$5,000
$5,000,0
$5,000,00
$5,000,000
$5,0000

Substitution
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