Question

can someone tell me the regular expression which will
check if value is 0.0 or 00.00 and that it is a positive value.

Answer 1

This should work:

/^0*(\.0+)$?/

0        -> true
.0       -> true
.000     -> true
.001     -> false
.01      -> false
1.0000   -> false
0.000000 -> true
1.1100   -> false

Note: this regex assumes there are no constructs like +0.00; if you need something like that, use this: /^\+?0*(\.0+)$?/. Also, if you ask me, you should the parseFloat(str) === 0.0 equivalent for your language.