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Returns a copy of +self+ with
{Unicode normalization}[https://unicode.org/reports/tr15] applied.
Argument +form+ must be one of the following symbols
(see {Unicode normalization forms}[https://unicode.org/reports/tr15/#Norm_Forms]):
- +:nfc+: Canonical decomposition, followed by canonical composition.
- +:nfd+: Canonical decomposition.
- +:nfkc+: Compatibility decomposition, followed by canonical composition.
- +:nfkd+: Compatibility decomposition.
The encoding of +self+ must be one of:
- <tt>Encoding::UTF_8</tt>.
- <tt>Encoding::UTF_16BE</tt>.
- <tt>Encoding::UTF_16LE</tt>.
- <tt>Encoding::UTF_32BE</tt>.
- <tt>Encoding::UTF_32LE</tt>.
- <tt>Encoding::GB18030</tt>.
- <tt>Encoding::UCS_2BE</tt>.
- <tt>Encoding::UCS_4BE</tt>.
Examples:
"a\u0300".unicode_normalize # => "à" # Lowercase 'a' with grave accens.
"a\u0300".unicode_normalize(:nfd) # => "à" # Same.
Related: see {Converting to New String}[rdoc-ref:String@Converting+to+New+String].
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