Scanning for a substring in Icon

If you want to know whether a particular target string t occurs anywhere within a string s, use the function

    find ( t, s )

If t is not found anywhere within s, the ``find()'' function fails.
If t is found in one or more locations within s, then ``find ( t, s )'' generates all the locations where t is found (see `Using generators in Icon').

For example, the expression

    find ( "honest", "politician" )

fails, while the expression

    every write ( find ( "y", "syzygy" ) ) );

writes three lines containing the numbers 2, 4, and 6 (the positions of ``y'' characters within the string "syzygy").

Next: Implicit scanning in Icon
See also: Using strings in Icon
Previous: Checking for an initial substring in Icon
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John Shipman, john@nmt.edu