Java Utililty Methods String Accent

int compareIgnoreCaseAndAccent(String string1, String string2, Locale locale)
Performs a string comparison ignoring case and accent.

if (string1 == null || string2 == null) {
 if (string1 == null && string2 == null)
 return 0;
 if (string1 == null)
 return -1;
 return 1;
Collator collator = Collator.getInstance(locale);
...

String deAccent(final @Nonnull String string)
See http://stackoverflow.com/questions/1008802/converting-symbols-accent-letters-to-english-alphabet

final String nfdNormalizedString = java.text.Normalizer.normalize(string, java.text.Normalizer.Form.NFD);
final Pattern pattern = Pattern.compile("\\p{InCombiningDiacriticalMarks}+");
return pattern.matcher(nfdNormalizedString).replaceAll("");

String deAccent(String str)
de Accent

if (str == null)
 return null;
String nfdNormalizedString = Normalizer.normalize(str, Normalizer.Form.NFD);
Pattern pattern = Pattern.compile("\\p{InCombiningDiacriticalMarks}+");
return pattern.matcher(nfdNormalizedString).replaceAll("");

String deAccent(String str)
de Accent

String nfdNormalizedString = Normalizer.normalize(str, Normalizer.Form.NFD);
Pattern pattern = Pattern.compile("\\p{InCombiningDiacriticalMarks}+");
return pattern.matcher(nfdNormalizedString).replaceAll("");

String deAccent(String str)
Removing diacritical marks aka accents

String nfdNormalizedString = Normalizer.normalize(str, Normalizer.Form.NFD);
Pattern pattern = Pattern.compile("\\p{InCombiningDiacriticalMarks}+"); 
return pattern.matcher(nfdNormalizedString).replaceAll(""); 

String deleteAccents(String text)
Remove accents from string

String nfdNormalizedString = Normalizer.normalize(text, Normalizer.Form.NFD);
Pattern pattern = Pattern.compile("\\p{InCombiningDiacriticalMarks}+");
text = pattern.matcher(nfdNormalizedString).replaceAll("");
return text;

boolean equalsIgnoreAccents(String lhs, String rhs, Locale locale)
equals Ignore Accents

Collator collator = Collator.getInstance(locale);
collator.setStrength(Collator.PRIMARY);
int comparison = collator.compare(lhs, rhs);
return (comparison == 0);

boolean equalsIgnoreAccentsAndCase(String s1, String s2)
equals Ignore Accents And Case

return equalsIgnoreAccents(s1.toLowerCase(), s2.toLowerCase());

boolean equalsIgnoreCaseAndAccent(String string1, String string2, Locale locale)
equals Ignore Case And Accent

return compareIgnoreCaseAndAccent(string1, string2, locale) == 0;

boolean equalsStringIgnoringAccents(String str1, String str2)
equals String Ignoring Accents

final Collator instance = Collator.getInstance();
instance.setStrength(Collator.NO_DECOMPOSITION);
if (instance.compare(str1, str2) == 0) {
 return true;
} else {
 return false;