String#ascii_only?

() -> bool

ascii_only? → true or false

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

See also #append_as_bytes #b #[]= #byteindex also in 4.1 · 4.0 · 3.3 · 3.2 · 3.1 · 3.0