Regular Expressions 101

^start of line

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

Group 1([ ,]?\d{3})*

*repeats the group contents below any number of times:

Character Class[ ,]?

?matches at most one character from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

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

Group 2([.,]\d+)?

?repeats the group contents below at most once:

Character Class[.,]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\d+a 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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

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

New

valid
1000
1,000
1,000.00
1000.00
1,000,000.12

invalid
1000.00.00
1,0.00
1,000,00.00