Method: Regexp#===

Defined in:

re.c

#===(string) ⇒ Boolean

Returns true if self finds a match in string:

/^[a-z]*$/ === 'HELLO' # => false
/^[A-Z]*$/ === 'HELLO' # => true

This method is called in case statements:

s = 'HELLO'
case s
when /\A[a-z]*\z/; print "Lower case\n"
when /\A[A-Z]*\z/; print "Upper case\n"
else               print "Mixed case\n"
end # => "Upper case"

Returns:

• (Boolean)

# File 're.c', line 3723

static VALUE
rb_reg_eqq(VALUE re, VALUE str)
{
    long start;

    str = reg_operand(str, FALSE);
    if (NIL_P(str)) {
        rb_backref_set(Qnil);
        return Qfalse;
    }
    start = rb_reg_search(re, str, 0, 0);
    return RBOOL(start >= 0);
}