Determines whether something is valid in a certain context. Currently only implemented for determining if a number is within the precision that wikipedia expressions can handle.

true if the argument is valid, false if it is not.

{{valid|number=A}} = गलत (संख्या नहीं है)
{{valid|number=1234}} = सही
{{valid|number=+1234}} = सही
{{valid|number=-1234}} = सही
{{valid|number=(1234)}} = सही (one pair of parenthesis is allowed)
{{valid|number=--1234}} = गलत (incorrect sign use)
{{valid|number=1234567890}} = सही
{{valid|number=12345678901234567890}} = गलत (too large)
{{valid|number=1.234567890}} = सही
{{valid|number=1.2345678901234567890}} = गलत (too many decimals)