Regular Expressions 101

Negative Lookbehind(?<!\S)

\Sany non-whitespace character

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

\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 at least once

Negative Lookahead(?!\S)

\Sany non-whitespace character

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

(?<!\S)\$\d{1,3}(?:,\d{3})*(?:\.\d+)?(?!\S)

New

$123
$123.456
$123,456
$123,456.789
$12,000,000
aaaa$42,000,00
$42,000,000aaa
aaa$42,000,000aaaa