Checking the initial characters of a string in Icon

The Icon function ``many(c, s)'' is used to find out how many of the initial characters of s are in the cset c.

If the first character of s is not in c, the ``many()'' function fails.
If at least one character matches, the function returns the position between the last character that matches and the first character that doesn't match (see `How Icon positions are numbered').

For example, this expression

    many ( &letters, "12345" )

fails, while this expression

    many ( &letters, "abc123" )

returns 4, the position in the string just after its initial letters.

Next: Checking for an initial substring in Icon
See also: Using strings in Icon
Previous: Checking the first character of a string in Icon
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John Shipman, john@nmt.edu