Maintenance Ruby 3.3 gets fixes, but no new features. Switch to Ruby 4.0 →
instance method
String#ascii_only?
ascii_only? → true or false
string.c
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static VALUE
rb_str_is_ascii_only_p(VALUE str)
{
int cr = rb_enc_str_coderange(str);
return RBOOL(cr == ENC_CODERANGE_7BIT);
}
Returns true if self contains only ASCII characters, false otherwise:
Example
'abc'.ascii_only? # => true "abc\u{6666}".ascii_only? # => false