eql?(p1)
public
Equality—Two regexps are equal if their patterns are identical, they have
the same character set code, and their casefold? values are the same.
/abc/ == /abc/x
/abc/ == /abc/i
/abc/ == /abc/n
/abc/u == /abc/n
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static VALUE
rb_reg_equal(VALUE re1, VALUE re2)
{
if (re1 == re2) return Qtrue;
if (TYPE(re2) != T_REGEXP) return Qfalse;
rb_reg_check(re1); rb_reg_check(re2);
if (FL_TEST(re1, KCODE_FIXED) != FL_TEST(re2, KCODE_FIXED)) return Qfalse;
if (RREGEXP(re1)->ptr->options != RREGEXP(re2)->ptr->options) return Qfalse;
if (RREGEXP_SRC_LEN(re1) != RREGEXP_SRC_LEN(re2)) return Qfalse;
if (ENCODING_GET(re1) != ENCODING_GET(re2)) return Qfalse;
if (memcmp(RREGEXP_SRC_PTR(re1), RREGEXP_SRC_PTR(re2), RREGEXP_SRC_LEN(re1)) == 0) {
return Qtrue;
}
return Qfalse;
}