Unicode composed normalized form (NFC)
Normalize String to Unicode Canonical Composition Form
Strings that look identical can have different underlying representations. The Unicode canonical composition form (NFC) ensures that equivalent strings have a unique binary representation.
Consider the string
"jalapeño", where the character
"ñ" is represented as the character
"n" followed by the code unit
"\x0303", which corresponds to the diacritic
"~". On some systems, the character
"ñ" appears as two characters. The string has length 9.
str = compose("jalapen\x0303o")
str = "jalapeño"
ans = 9
Normalize the string using the
textanalytics.unicode.nfc function. On some systems, the output string appears to be identical to the input string.
newStr = textanalytics.unicode.nfc(str)
newStr = "jalapeño"
View the length of the normalized string. The normalized representation includes one fewer code units. In this case, the function merges the letter
"n" and the diacritic
"~" into a single code unit that represents
ans = 8
Extract the seventh code unit of the normalized string.
ans = "ñ"
newStr are equal using the
== operator. The operator returns
0 because the strings have different underlying representations.
tf = str == newStr
tf = logical 0
str — Input text
string array | character vector | cell array of character vectors
Input text, specified as a string array, character vector, or cell array of character vectors.
["An example of a short sentence."; "A second short
Unicode Normalization Forms
For more information about Unicode normalization forms, see Unicode Standard Annex #15 Unicode Normalization Forms.
 Whistler, Ken, ed. "Unicode Standard Annex #15: Unicode Normalization Forms." Unicode Technical Reports, August 27, 2021. https://unicode.org/reports/tr15/.
Introduced in R2022b