Checking for an initial substring in Icon

To check whether a string begins with a particular sequence of characters, use the function

    match ( t, s )

where t is the target string to be searched for, and s is the string to be searched.

If t matches the initial characters of s, the function returns the position within s just after the part that matched t.
If t does not match the initial characters of s, the ``match()'' function fails.

For example, the expression

    match ( "foo", "rumplestiltskin" )

fails, while the expression

    match ( "foo", "foobar" )

succeeds and returns the value 4, which is the position just to the left of the "bar" in the second argument.

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