NAME

Port of Perl's index() / rindex() built-ins

SYNOPSIS

use P5index; # exports index() / rindex()

say index("foobar", "bar");    # 3
say index("foofoo", "foo", 1); # 3
say index("foofoo", "bar");    # -1

say rindex("foobar", "bar");    # 3
say rindex("foofoo", "foo", 4); # 3
say rindex("foofoo", "bar");    # -1

DESCRIPTION

This module tries to mimic the behaviour of Perl's index / rindex built-ins as closely as possible in the Raku Programming Language.

ORIGINAL PERL 5 DOCUMENTATION

index STR,SUBSTR,POSITION
index STR,SUBSTR
        The index function searches for one string within another, but
        without the wildcard-like behavior of a full regular-expression
        pattern match. It returns the position of the first occurrence of
        SUBSTR in STR at or after POSITION. If POSITION is omitted, starts
        searching from the beginning of the string. POSITION before the
        beginning of the string or after its end is treated as if it were
        the beginning or the end, respectively. POSITION and the return
        value are based at zero. If the substring is not found, "index"
        returns -1.

rindex STR,SUBSTR,POSITION
rindex STR,SUBSTR
        Works just like index() except that it returns the position of the
        last occurrence of SUBSTR in STR. If POSITION is specified,
        returns the last occurrence beginning at or before that position.

AUTHOR

Elizabeth Mattijsen [email protected]

Source can be located at: https://github.com/lizmat/P5index . Comments and Pull Requests are welcome.

COPYRIGHT AND LICENSE

Copyright 2018, 2019, 2020, 2021 Elizabeth Mattijsen

Re-imagined from Perl as part of the CPAN Butterfly Plan.

This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.