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

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mg

^ asserts position at start of a line

\$

matches the character $ with index 36? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)

1st Capturing Group

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

1st Alternative

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

Match a single character present in the list below

[0-9]

{1,3} matches the previous token between 1 and 3 times, as many times as possible, giving back as needed (greedy)

0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)

, matches the character , with index 44_{10} (2C_{16} or 54_{8}) literally (case sensitive)

2nd Capturing Group

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

* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)

A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data

Match a single character present in the list below

[0-9]

{3} matches the previous token exactly 3 times

0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)

, matches the character , with index 44_{10} (2C_{16} or 54_{8}) literally (case sensitive)

Match a single character present in the list below

[0-9]

{3} matches the previous token exactly 3 times

0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)

2nd Alternative

[0-9]+

Match a single character present in the list below

[0-9]

+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)

0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)

3rd Capturing Group

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

? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)

\. matches the character . with index 46_{10} (2E_{16} or 56_{8}) literally (case sensitive)

Match a single character present in the list below

[0-9]

0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)

Match a single character present in the list below

[0-9]

0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)

$ asserts position at the end of a line

Global pattern flags

m modifier: **m**ulti line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)

g modifier: **g**lobal. All matches (don't return after first match)

Your regular expression does not match the subject string.

No Match

/

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mg

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