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Enable support for Unicode case folding.
When used together with the CASE_INSENSITIVE flag as the flag value for the compile() method, and if regular expressions are used to search for Unicode characters, both cases of Unicode characters will match.
import java.util.regex.Matcher; import java.util.regex.Pattern; public class UNICODE_CASE_Example { public static void main( String args[] ) { String regex = \"\u00de\"; //Compiling the regular expression Pattern pattern = Pattern.compile(regex, Pattern.UNICODE_CASE|Pattern.CASE_INSENSITIVE); //Retrieving the matcher object String str[] = {\"\u00de\", \"\u00fe\", \"\u00ee\", \"\u00ce\"}; for(String ele : str) { Matcher matcher = pattern.matcher(ele); if(matcher.matches()) { System.out.println(ele+" is a match for "+regex); } else { System.out.println(ele+" is not a match for "+regex); } } } }
Output Result
Þ is a match for Þ þ is a match for Þ î is not a match for Þ Î is not a match for Þ