Regex to remove blacklisted words from a sentence

Question

How can I use a regext to filter out a list of blacklisted(Obscene) words, such that if a black listed words is like \'Bill Joseph\'

 Then \'I am Bill Josephine         


        

Answer 1

Make sure the word is surrounded by a word boundary ".*\\b" + badWord + "\\b.*"

Answer 2

Simple, and this works:

String badStrRegex = "\\WBill Joseph\\W?";
Pattern pattern = Pattern.compile(badStrRegex);
Matcher m = pattern.matcher(testStr);  //testStr is your string under test
boolean isBad = m.find();

It works!! Tested against all your input.

Answer 3

Use the negation of the alphanumeric character class:

"[^A-Za-z0-9]Bill Joseph[^A-Za-z0-9]"

Using "\W" in place of "[^A-Za-z0-9]" would work in most cases except when there is an underscore before/after the name. So "Bill Joseph_" still would be seen as valid.