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• It is important that the input type for this question be text, not number, integer, or decimal; therefore you should use the question type "Text" or "Numeric ID/Phone Number" (this question type is technically text with a numeric keyboard appearance). Numbers are represented and compared by their numeric value, so "65.00" and "65" are equivalent.
• These validation example often don't validate the actual size of the number at all. You can similarly restrict the values before the decimal sign in your expression using regular expressions, but remember that if it is difficult to express whether a value is valid, users may have a hard time entering the correct value.
• It is possible to restrict the input range in a language that uses different Unicode characters, to do that you would input the range of Unicode characters for that language in the regex expression

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Example 5: United Kingdom NHS Number

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The United Kingdom NHS number is a 10 digit number (9 real, 1 check digit). It is validated using the Modulus 11 algorithm Details about it are here: http://www.datadictionary.nhs.uk/version2/data_dictionary/data_field_notes/n/nhs_number_de.asp?shownav=0

Here's the expression syntax to validate it (assuming your Question ID is 'NHS_Number'):

`11 - (substr(#form/NHS_Number, 0, 1) * 10 + substr(#form/NHS_Number, 1, 2) * 9 + substr(#form/NHS_Number, 2, 3) * 8 + substr(#form/NHS_Number, 3, 4) * 7 + substr(#form/NHS_Number, 4, 5) * 6 + substr(#form/NHS_Number, 5, 6) * 5 + substr(#form/NHS_Number, 6, 7) * 4 + substr(#form/NHS_Number, 7, 8) * 3 + substr(#form/NHS_Number, 8, 9) * 2) mod 11 = substr(#form/NHS_Number, 9, 10)`

For more examples of phone number and email address validation, see: App Email and Phone Number Input Guidance

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