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starts-with
Combined from primary sources listed below.

In Str§

See primary documentation in context for method starts-with 

multi method starts-with(Str:D: Str(Cool) $needle, :i(:$ignorecase), :m(:$ignoremark) --> Bool:D)

Returns True if the invocant is identical to or starts with $needle.

say "Hello, World".starts-with("Hello");     # OUTPUT: «True␤»
say "https://raku.org/".starts-with('ftp');  # OUTPUT: «False␤»

Since Rakudo version 2020.02, if the optional named parameter :ignorecase, or :i, is specified, the comparison of the invocant and $needle ignores the distinction between uppercase, lowercase and titlecase letters.

say "Hello, World".starts-with("hello");              # OUTPUT: «False␤»
say "Hello, World".starts-with("hello", :ignorecase); # OUTPUT: «True␤»

Since Rakudo 2020.02, if the optional named parameter :ignoremark, or :m, is specified, the comparison of the invocant and $needle only considers base characters, and ignores additional marks such as combining accents.

say "abc".starts-with("ä");              # OUTPUT: «False␤»
say "abc".starts-with("ä", :ignoremark); # OUTPUT: «True␤»