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I have
<asp:RegularExpressionValidator ValidationExpression="\d+{1,4}(?:[.,]\d{1,4})?" />
but it doesn’t’ work, parser throws ArgumentException:
parsing "\d+{1,4}(?:[.,]\d{1,4})?"
Nested quantifier {.
Where is my mistake? I want to allow strings like xxxx,xxxx – from 1 to 4 digits and decimal digits are not required, e.g.: 1000, 99,99, 0,2498, etc.
I think this should do it: