import java.util.regex.*;
   
Pattern fieldRegex = Pattern.compile(
   "\\G(?:^|,)                                  \n"+
   "(?:                                         \n"+
   "   # Either a double-quoted field ...       \n"+
   "   \"  # field's opening quote              \n"+
   "    (   (?: [^\"]++ | \"\" )*+   )          \n"+
   "   \"  # field's closing quote              \n"+
   " #  ... or ...                              \n"+
   " |                                          \n"+
   "   # ... some non-quote/non-comma text ...  \n"+
   "   ( [^\",]* )                              \n"+
   " )                       \n", Pattern.COMMENTS);
Pattern quotesRegex = Pattern.compile("\"\"");
   
// Given the string in 'line', find all the fields . . . 


Matcher m = fieldRegex.matcher(line);
while (m.find())
{
    String field;
    if (m.group(1) != null) {
        field = quotesRegex.matcher(m.group(1)).replaceAll("\"");
    } else {
        field = m.group(2);
    }
    // We can now work with the field . . . 
    System.out.println("[" + field + "]");
}




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Copyright 1997-2025 Jeffrey Friedl