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Using csets to describe sets of characters in Icon

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Before we look at Icon's functions for analyzing strings, we must first understand the idea of the cset, which is a basic Icon type that describes sets of characters.

Csets are for describing generic types of characters, such as ``letters,'' ``digits,'' and ``punctuation marks.'' Mathematically, a cset is a subset of the external character set (such as ASCII).

For example, suppose we want to talk about ``delimiter'' characters, where a delimiter is either a period, comma, or slash. This Icon statement would define a variable called delim as this cset:

    delim  :=  '.,/';
Characters written between single quotes ('') define a cset. A number of csets are predefined in Icon:
Next: Analyzing strings with Icon
See also: Using strings in Icon
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John Shipman,
Last updated: 1996/01/06 21:12:57 UT
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