Using Regular Expressions to validate a fixed length numerical string.
Using Ruby and Regular Sxpressions, this code successfully validates a string if it contains exactly 3 numbers.
a = '547' /^\d\d\d$/ ~= a
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Using Regular Expressions to validate a numerical string.
Using Ruby and Regular Expressions, this code validates a string for numbers only. If the string variable contains only numbers then 0 will be returned otherwise nil.
a = '134323' /^[0-9]*$/ =~ a #result returns 0, indicating success
