True if data seems to be textual, false otherwise. Note: Empty data is not considered to be textual.
assert(isTextualData("English")); assert(isTextualData("日本語")); assert(isTextualData("Русский язык")); assert(isTextualData("English and кириллица")); assert(isTextualData("Copyright ©")); assert(isTextualData("0A a!\n\r\t~(){}.?")); assert(isTextualData("Hello \U0001F603")); assert(isTextualData("日本語"[0..$-1])); assert(isTextualData("Русский язык"[0..$-1])); assert(isTextualData("Hello \U0001F603"[0..$-1])); assert(isTextualData("text \u00A2"[0..$-1])); assert(!isTextualData("text\U000F0000text"));//private use assert(!isTextualData("")); assert(!isTextualData("abc\x01")); assert(!isTextualData("\xFF\xFE")); assert(!isTextualData("\xd0\x54")); assert(!isTextualData("\x10"));
Check if data seems to be textual. Can be used to choose whether to use text/plain or application/octet-stream as fallback.