Regular Expressions 101

Pro

^start of line

Non-Capturing Group(?:\d{1,3}(,\d{3})*|\d+|\d{2}(?:,\d{2})*,\d{3})

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

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

Group 1(,\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+

\d+a digit, repeated at least once

3rd Alternative\d{2}(?:,\d{2})*,\d{3}

\d{2}a digit, repeated exactly 2 times

Non-Capturing Group(?:,\d{2})*

*repeats the group contents below any number of times:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\d{2}a digit, repeated exactly 2 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

$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

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26 tokens

^(?:\d{1,3}(,\d{3})*|\d+|\d{2}(?:,\d{2})*,\d{3})(?:\.\d+)?$

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