JavaScript Decimal Place Restriction With RegEx

Question

I have some client-side validation against a text box, which only allows numbers up to two decimal places with no other input.

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Answer 1

The . character has special meaning in RegEx so needs escaping.

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

This matches 123.45, 123.4, 123 and .2, .24 but not emtpy string, 123., 123.456