Java doc says  A character is considered to be a letter if its general category type, provided by Character.getType(ch), is any of the following:

• UPPERCASE_LETTER - General category "Lu" in the Unicode specification
• LOWERCASE_LETTER - General category "Ll" in the Unicode specification
• TITLECASE_LETTER - General category "Lt" in the Unicode specification.
• MODIFIER_LETTER - General category "Lm" in the Unicode specification
• OTHER_LETTER - General category "Lo" in the Unicode specification

 

Raw Match Pattern:
\p{L}

Match Pattern Explanation:
The regular expression:

(?-imsx:\p{L})

matches as follows:
  
NODE                     EXPLANATION
----------------------------------------------------------------------
(?-imsx:                 group, but do not capture (case-sensitive)
                         (with ^ and $ matching normally) (with . not
                         matching \n) (matching whitespace and #
                         normally):
----------------------------------------------------------------------
  \p{L}                    any character of: UTF macro 'L'
----------------------------------------------------------------------
)                        end of grouping
----------------------------------------------------------------------

Java Code Example:
import java.util.regex.Pattern;
import java.util.regex.Matcher;
class Module1{
  public static void main(String[] asd){
  String sourcestring = "source string to match with pattern";
  Pattern re = Pattern.compile("\\p{L}");
  Matcher m = re.matcher(sourcestring);
  int mIdx = 0;
    while (m.find()){
      for( int groupIdx = 0; groupIdx < m.groupCount()+1; groupIdx++ ){
        System.out.println( "[" + mIdx + "][" + groupIdx + "] = " + m.group(groupIdx));
      }
      mIdx++;
    }
  }
}


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Michael

"In theory, theory and practice are the same. In practice, they are not."
Albert Einstein

Thanks Michael. Solved my issue.