End of Life Ruby 3.2 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Kernel#sub

sub(pattern, replacement) → $_

sub(pattern) {|...| block } → $_

static VALUE
rb_f_sub(int argc, VALUE *argv, VALUE _)
{
    VALUE str = rb_funcall_passing_block(uscore_get(), rb_intern("sub"), argc, argv);
    rb_lastline_set(str);
    return str;
}

Equivalent to $_.sub(<i>args</i>), except that $_ will be updated if substitution occurs. Available only when -p/-n command line option specified.

See also #String #syntax_suggest_original_load #srand #syntax_suggest_original_require also in 4.1 · 4.0 · 3.4 · 3.3 · 3.1 · 3.0

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