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Checking initial string characters 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" )

    many ( &letters, "abc123" )