Regular Expressions 101

^start of line

Group 1(([1-9]\d{0,2}((,\d{3})*|(\d{3})*))|0?)

1st Alternative([1-9]\d{0,2}((,\d{3})*|(\d{3})*))

Group 2([1-9]\d{0,2}((,\d{3})*|(\d{3})*))

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\d{0,2}a digit, repeated between 0 and 2 times

Group 3((,\d{3})*|(\d{3})*)

1st Alternative(,\d{3})*

Group 4(,\d{3})*

*repeats the group contents below any number of times:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

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

2nd Alternative(\d{3})*

Group 5(\d{3})*

*repeats the group contents below any number of times:

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

2nd Alternative0?

0?optionally matches the literal 0 (48₁₀ / 60₈ / 30₁₆)

Group 6(\.\d+)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\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

Ready to run

Search reference

Regular Expression

^(([1-9]\d{0,2}((,\d{3})*|(\d{3})*))|0?)(\.\d+)?$