Regular Expressions 101

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/
^\d{1,3}(?:\.\d\d\d)*(?:,\d{1,2})?$
/
gm
^ asserts position at start of a line
\d
matches a digit (equivalent to [0-9])
{1,3} matches the previous token between 1 and 3 times, as many times as possible, giving back as needed (greedy)
Non-capturing group
(?:\.\d\d\d)*
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
\. matches the character . literally (case sensitive)
\d matches a digit (equivalent to [0-9])
\d matches a digit (equivalent to [0-9])
\d matches a digit (equivalent to [0-9])
Non-capturing group
(?:,\d{1,2})?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
, matches the character , literally (case sensitive)
\d
matches a digit (equivalent to [0-9])
{1,2} matches the previous token between 1 and 2 times, as many times as possible, giving back as needed (greedy)
$ asserts position at the end of a line
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String