VERIFY function

Purpose

Determine whether each character of a string is present in another string.

Syntax

x = VERIFY([start&,] MainString, MatchString)

Remarks

VERIFY returns zero if each character in MainString is present in MatchString.  If not, it returns the position of the first non-matching character in MainString.

This function is very useful for determining if a string contains only numeric digits, for example.

VERIFY is case-sensitive, so capitalization matters.

Restrictions

If start& evaluates to a position outside of the string on either side, or if start& is zero, VERIFY returns zero.

See also

INSTR, LCASE$, LTRIM$, MID$, REMOVE$, REPLACE, RIGHT$, RTRIM$, TALLY, TRIM$, UCASE$

Example

' returns 4 since "." is not in "0123456789"

x& = VERIFY("123.65,22.5", "0123456789")

' returns 7 since 5 starts it past the first non-digit ("." at position 4)

x& = VERIFY(5,"123.65,22.5", "0123456789")