Perl 6 Deep Dive

Methods to check the content of a string

The Str class defines a pair of methods—starts-with and ends-with—that check whether the string contains a given substring at the beginning or end of it, and return a Boolean value. Consider the following example, which displays the behavior of these methods:

say 'Hello, World'.starts-with('Hello'); # Truesay 'Hello, World'.starts-with('World'); # Falsesay 'Hello, World'.ends-with('Hello'); # Falsesay 'Hello, World'.ends-with('World'); # True

Regular expressions can be used instead of starts-with and end-with; refer to Chapter 11, Regexes, for the details.

Another set of functions—index, rindex, and indices—find the substring and return its position. The index method finds the most left occurrence ...