Check if a string can be converted into numeric

Check if a string can be converted into numeric

Hi,

Is there a way to create a function to check if a string can be converted to numeric ?  isNumeric

I'd like to convert kg in lbs but I want users to write "N/A" or other text instand of numeric values. I setup 2 fields. If the user write text, I want to copy text, If he enter numeric value, I want to convert.

Thanks for any tips.

Pascal Veilleux