Make decimal digits mandatory if dot entered in regex validation

Question

If regex validation is ^\d{0,10}(\.\d{0,2})?$, then maximum two digits are required after decimal which is optional.

But it allows "100." also. since the user has not entered any digit after decimal, how to validate and make decimal digits required if dot is entered

Are you aware that the regex also matches the empty string (which might or might not be desirable)? — Tim Pietzcker

Cody Caughlan Cody Caughlan · Accepted Answer · 2014-07-14T17:46:18

If you want to require 2 digits after the decimal if a period is provided then make your regex look like:

/^\d{0,10}(\.\d{2,})?$/

\d{2,} means that a mininum of two numbers is required - followed by any number of digits (which is why the expression is open-ended, e.g. 2, - if you require two and only two digits than provide both a lower- and upper-bound: {2,2}

Make decimal digits mandatory if dot entered in regex validation

2 Answers