Brian Dunning's FileMaker Custom Functions

is_valid_number ( some_text )

returns true (1) if the input text represents a valid number

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steve harley   steve harley
none please

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  Sample input:
is_number ("-012.30")
  Sample output:

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

useful for determining whether a string represents a valid number, including handing of negative numbers and decimal values; ignores leading and trailing spaces, but enforces proper use of hyphen (minus) and period (decimal point) if present



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Note: these functions are not guaranteed or supported by Please contact the individual developer with any questions or problems.

Under construction. Email me your wish list for improvements.