Regarding the RegEX -

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i want write regular expression should allow 1 value after decimal point. 1 have written is:

(n\/a)(n\/a)|\d+.?\d{0,1}

it accepting values per requirement problem is accepting 1. - i.e., if not giving value after decimal accepting.

in addition @wickramaranga's answer extracts first digit after decimal point if wish match on numbers can use lookarounds:

(?<!\.)\b\d+(?:\.(\d))?\b(?!\.)

this extract first digit (not including point) ensure number has 1 digit.

note includes number no decimals.

in order require there 1 , 1 digit:

(?<!\.)\b\d+\.(\d)\b(?!\.)

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