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I saw this as an answer for finding repeated words in a string. But when I use it, it thinks This and is are the same and deletes the is . Regex "\\b(\\w+)\\b\\s+\\1" Any idea why this is happening? Here is the code that I am using for duplicate removal public static String RemoveDuplicateWords(String input) { String originalText = input; String output = ""; Pattern p = Pattern.compile("\b(\w+)\b\s+\b\1\b", Pattern.MULTILINE+Pattern.CASE_INSENSITIVE); //Pattern p = Pattern.compile("\\b(\\w+)\\b\\s+\\1", Pattern.MULTILINE+Pattern.CASE_INSENSITIVE); Matcher m = p.matcher(input); if (!m.find()) output = "No duplicates found, no changes made to data"; else { while (m.find()) { if (output == "") output = input.replaceFirst(m.group(), m.group(1)); else output = output.replaceAll(m.group(), m.group(1)); } input = output; m = p.matcher(input); while (m.find()) { output = ""; if (output == "") output = input.replaceAll(m.group(), m.group(1)); else output = output.replaceAll(m.group(), m.group(1)); } } return output; }

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