New answers tagged regex
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You can use the following regular expression to match numbers starting at new line, having comma separator between groups of 3 digits.
^(?:\d{1,3}(?:(,?)\d{3})?(?:\1\d{3})*)$
Details:
^ asserts position at start of a line.
?: Match expression but do not capture it.
\d matches a digit (equal to [0-9]).
{1,3} Quantifier — Matches between 1 and 3 times, as ...
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