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I have list of keywords entered by the user and they may contains the special characters like $, #, @, ^, &, etc. As per my requirement when ever i receive list of text messages i need to search for all the keywords in every message. We need to match exact keyword . CASE 1: Simple Keyword - Simple Message I used \b to match exact keyword and it works fine. public static void main(String[] args) { String patternStr = "(?i)\\bHello\\b"; Pattern pattern = Pattern.compile(patternStr); List<String> strList = new ArrayList<String>(); strList.add("HHello Message"); strList.add("This is Hello Message "); strList.add("Now Hellos again."); for(String str : strList) { Matcher matcher = pattern.matcher(str); System.out.println(">> "+matcher.find()); } } OUTPUT as Expected >> false >> true >> false CASE 2 : Simple Keyword - Message with Special Character Now, if i run above same code for following messages then it didn't work as expected. List<String> strList = new ArrayList<String>(); strList.add("#Hello Message"); strList.add("This is Hello Message "); strList.add("Now Hellos again."); OUTPUT: true true false Expected OUTPUT false true false CASE 3 : Keyword & Message with Special Character If i receive following messages and Keyword is #Hello . I wrote following code but it didn't work . public static void main(String[] args) { String patternStr = "

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