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instance method
String#ascii_only?
str.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 cr == ENC_CODERANGE_7BIT ? Qtrue : Qfalse;
}
Returns true for a string which has only ASCII characters.
Example
"abc".force_encoding("UTF-8").ascii_only? #=> true "abc\u{6666}".force_encoding("UTF-8").ascii_only? #=> false