Using Regular Expressions to validate a fixed length numerical string.

jrobertson (James Robertson) — Tue, 09 Oct 2007 11:55:10 GMT

Using Ruby and Regular Sxpressions, this code successfully validates a string if it contains exactly 3 numbers.



a = '547'

/^\d\d\d$/ ~= a

Using Regular Expressions to validate a numerical string.

jrobertson (James Robertson) — Tue, 09 Oct 2007 11:45:13 GMT

Using Ruby and Regular Expressions, this code validates a string for numbers only. If the string variable contains only numbers then 0 will be returned otherwise nil.



a = '134323'

/^[0-9]*$/ =~ a

#result returns 0, indicating success

DZone Snippets: numeric code

Using Regular Expressions to validate a fixed length numerical string.

Using Regular Expressions to validate a numerical string.