How can diacritics be ignored when matching a regex pattern?

Question

I need to regex-search string for occurences with these conditions:

• on word boundary
• case-insensitive
• ignore diacritics

My code:

CharSequence text = "One Twó";
String searchString = "two";
Pattern p = Pattern.compile("(?i)\\b"+searchString);
Matcher m = p.matcher(text);
while(m.find()) {
   int s = m.start();
   int e = m.end();
}

The first 2 conditions are achieved by the (?i) and \b pattern expressions.

I still need to achieve 3rd goal, ignoring diacritics, so in above the searched string "two" would match text "Twó" in the text. How can this be accomplished?

Answer 1

I don't have a perfect regex based solution. Maybe it exists, maybe it doesn't.

A suggestion for a workaround though: You could try to remove the diacritics before you try to match the string.

Related question:

• Remove diacritical marks (ń ǹ ň ñ ṅ ņ ṇ ṋ ṉ ̈ ɲ ƞ ᶇ ɳ ȵ) from Unicode chars