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Analyzing strings with Icon

Icon has a number of useful built-in functions for working with textual strings. Here are some of the more commonly used ones:

• To check whether the first character of a string is a particular character or type of character, see checking the first character of a string.
• If you want to find all the characters of a given kind at the beginning of a string, see checking initial string characters.
• To see whether a string starts with a particular sequence of characters, see checking an initial substring.
• To locate the occurrences of some small string within a larger one, see scanning for a substring.