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index
Combined from primary sources listed below.

In Cool§

See primary documentation in context for routine index 

multi        index(Cool:D $s, Cool:D $needle, :i(:$ignorecase), :m(:$ignoremark) --> Int:D)
multi        index(Cool:D $s, Cool:D $needle, Cool:D $pos, :i(:$ignorecase), :m(:$ignoremark) --> Int:D)
multi method index(Cool:D: Cool:D $needle --> Int:D)
multi method index(Cool:D: Cool:D $needle, :m(:$ignoremark)! --> Int:D)
multi method index(Cool:D: Cool:D $needle, :i(:$ignorecase)!, :m(:$ignoremark) --> Int:D)
multi method index(Cool:D: Cool:D $needle, Cool:D $pos --> Int:D)
multi method index(Cool:D: Cool:D $needle, Cool:D $pos, :m(:$ignoremark)!  --> Int:D)
multi method index(Cool:D: Cool:D $needle, Cool:D $pos, :i(:$ignorecase)!, :m(:$ignoremark) --> Int:D)

Coerces the first two arguments (in method form, also counting the invocant) to a Str, and searches for $needle in the string $s starting from $pos. It returns the offset into the string where $needle was found, and Nil if it was not found.

See the documentation in type Str for examples.

In Str§

See primary documentation in context for method index 

multi method index(Str:D: Cool:D $needle, :i(:$ignorecase), :m(:$ignoremark) --> Int:D)
multi method index(Str:D: Str:D $needle, :i(:$ignorecase), :m(:$ignoremark) --> Int:D)
multi method index(Str:D: Cool:D $needle, Cool:D $pos, :i(:$ignorecase), :m(:$ignoremark) --> Int:D)
multi method index(Str:D: Str:D $needle, Int:D $pos, :i(:$ignorecase), :m(:$ignoremark) --> Int:D)
multi method index(Str:D: @needles --> Int:D)
multi method index(Str:D: @needles, :m(:$ignoremark)! --> Int:D)
multi method index(Str:D: @needles, :i(:$ignorecase)!, :m(:$ignoremark) --> Int:D)

Searches for $needle in the string starting from $pos (if present). It returns the offset into the string where $needle was found, and Nil if it was not found.

Since Rakudo version 2020.02, if the optional named parameter :ignorecase, or :i, is specified, the search for $needle ignores the distinction between uppercase, lowercase and titlecase letters. In addition, if the optional named parameter :ignoremark, or :m, is specified, the search for $needle only considers base characters, and ignores additional marks such as combining accents.

Since Rakudo version 2020.05, index accepts a list of needles to search the string with, and return the lowest index found or Nil.

Examples:

say "Camelia is a butterfly".index("a");         # OUTPUT: «1␤»
say "Camelia is a butterfly".index("a", 2);      # OUTPUT: «6␤»
say "Camelia is a butterfly".index("er");        # OUTPUT: «17␤»
say "Camelia is a butterfly".index("Camel");     # OUTPUT: «0␤»
say "Camelia is a butterfly".index("Onion");     # OUTPUT: «Nil␤»
say "Camelia is a butterfly".index(<a e i u>);   # OUTPUT: «1␤»
say "Camelia is a butterfly".index(<a c>, :i);   # OUTPUT: «0␤»
say "Camelia is a butterfly".index(('w', 'x'));  # OUTPUT: «Nil␤»

say "Hello, World".index("world");               # OUTPUT: «Nil␤»
say "Hello, World".index("world", :ignorecase);  # OUTPUT: «7␤»

say "abc".index("ä");                            # OUTPUT: «Nil␤»
say "abc".index("ä", :ignoremark);               # OUTPUT: «0␤»
say "abc".index("x").defined ?? 'OK' !! 'NOT';   # OUTPUT: «NOT␤»

Other forms of index, including subs, are inherited from Cool.