RandomString ( stringLength ; minCharCode ; maxCharCode )

Returns a string of random characters.

Average rating: 4.4 (28 votes) Log in to vote

Jeremy Bante

https://github.com/jbante/

Sample input:

List (
RandomString ( 10 ; 65 ; 90 ); // A-Z
RandomString ( 10 ; 32 ; 126 ); // ASCII printable characters
RandomString ( 10 ; "" ; "" ) // possible characters with Char function
)

Sample output:

OJQKMPBLWQ
3S/ezuJFyP
짝ᰨ憑ﲬ춧闳豕姿甒

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

/**
 * =====================================
 * RandomString ( stringLength ; minCharCode ; maxCharCode )
 *
 * RETURNS:
 *		A random text string of length stringLength. The returned string can
 *		include characters from the range between minCharCode and maxCharCode,
 *		up to the entire character set supported by FileMaker, excluding ASCII
 *		control characters (code 0 through 32, and 127).
 *
 * PARAMETERS:
 *		stringLength: The length of the desired result
 *		minCharCode: The Unicode character code at the minimum of the range of
 *		acceptable values. Defaults to 32 when passed a smaller or empty value.
 *		maxCharCode: The Unicode character code at the maximum of the range of
 *		acceptable values. Defaults to 65535 when passed a larger or empty
 *		value.
 *
 * DEPENDENCIES: none
 *
 * HISTORY:
 *		MODIFIED on 2012-11-28 by Jeremy Bante <http://scr.im/jbante> to not
 *		return characters between Unicode 55295 and 57348, which are sometimes
 *		mishandled by FileMaker.
 *		MODIFIED on 2012-11-10 by Jeremy Bante <http://scr.im/jbante> to fix a
 *		bug where the character range could be incorrect if one parameter is
 *		empty and the other is not.
 *		CREATED on 2012-11-08 by Jeremy Bante <http://scr.im/jbante>.
 * =====================================
 */

Case (
	stringLength < 1;
		"";

	IsEmpty ( minCharCode ) or IsEmpty ( maxCharCode );
		RandomString (
			stringLength;
			Max ( minCharCode ; 32 );
			Min ( maxCharCode ; 65535 )
		);

	maxCharCode < minCharCode;
		RandomString ( stringLength ; maxCharCode ; minCharCode );

	/* Else */
		Let ( [
			minCharCode = Max ( minCharCode ; 32 );
			maxCharCode =
				If ( maxCharCode > 57348;	// characters 55295-57348 forbidden
					Min ( maxCharCode ; 65535 );
					/* Else */ Min ( maxCharCode ; 55294 )
				);
			~code = Round ( Random * ( maxCharCode - minCharCode ) + minCharCode ; 0 )
		];
			Case (
				( ~code > 55294 and ~code < 57349 )	// forbidden range
				or ~code = 127;	// DEL[ete] character, reject & re-try
					RandomString ( stringLength ; minCharCode ; maxCharCode );

				/* Else */
					Char ( ~code )
					& RandomString ( stringLength - 1 ; minCharCode ; maxCharCode )
			)
		)
)

Returns a random text string of length stringLength. The returned string can include characters from the range between minCharCode and maxCharCode, up to the entire character set supported by FileMaker, excluding ASCII control characters (code 0 through 32, and 127).

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

RandomString ( stringLength ; minCharCode ; maxCharCode )

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