Methods by type

String tests & search

Full

Boolean substring tests and finding positions — contains, starts-with, indices.

Beyond .index, Str has Boolean predicates for the common "does it contain / begin / end with" questions, plus .indices for every position.

Boolean substring tests #

say "hello".contains("ell");
say "hello".starts-with("he");
say "hello".ends-with("lo");

Output

True
True
True

These read better than comparing an .index against -1 (Raku returns Nil, not -1, for a missing substring anyway).

.indices returns every start position of the substring, in order.

say "hello".indices("l");

Output

(2 3)

.contains, .starts-with, .ends-with accept a string or a regex, so .contains(/\d/) tests for any digit.
.index returns the first position (or Nil); .rindex searches from the end.
For extracting the matched pieces rather than testing, use .comb or a regex match — see String methods.