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If the length is 2 then UTF-16 is being used. 4 indicates UTF-8. 3 or 6 may indicate CESU-8. 1 may indicate UTF-32, but more likely indicates the language decodes the string to code points before measuring the "length".
Text with variable-length encoding such as UTF-8 or UTF-16 is harder to process if there is a need to work with individual code units as opposed to working with code points. Searching is unaffected by whether the characters are variably sized since a search for a sequence of code units does not care about the divisions.
UTF-16 was devised to break free of the 65,536-character limit of the original Unicode (1.x) without breaking compatibility with the 16-bit encoding. In UTF-16, singletons have the range 0000–D7FF (55,296 code points) and E000–FFFF (8192 code points, 63,488 in total), lead units the range D800–DBFF (1024 code points) and trail units the ...
UTF-16 – Extends UCS-2 to cover the whole of Unicode with sequences of one or two 16-bit elements; GB 18030 – A full-Unicode variable-length code designed for compatibility with older Chinese multibyte encodings; Huffman coding – A technique for expressing more common characters using shorter bit strings than are used for less common ...
UTF-16: code units are twice as long as 8-bit code units. Therefore, any code point with a scalar value less than U+10000 is encoded with a single code unit. Code points with a value U+10000 or higher require two code units each. These pairs of code units have a unique term in UTF-16: "Unicode surrogate pairs".
In November 2003, UTF-8 was restricted by RFC 3629 to match the constraints of the UTF-16 character encoding: explicitly prohibiting code points corresponding to the high and low surrogate characters removed more than 3% of the three-byte sequences, and ending at U+10FFFF removed more than 48% of the four-byte sequences and all five- and six ...
The length of a string is the number of code units before the zero code unit. [1] ... As UTF-16 is a variable-width encoding, ...
The length of a string is found by searching for the (first) NUL. ... However, some languages implement a string of 16-bit UTF-16 characters, terminated by a 16-bit ...