Regular Expressions in Java

• Import java.util.regex package as Java doesn’t have a built-in regex class
• Included classes:
  • Pattern class
    • Defines a pattern to be used in a search
  • Matcher class
    • Used to search for pattern
  • PatternSyntaxException class
    • Indicates syntax error in regex pattern

Pattern pattern = Pattern.compile(/\W+/g, Pattern.CASE_INSENSITIVE);
Matcher matcher = pattern.matcher("This is cool");
boolean matchFound = matcher.find();

Pattern.compile(regex).matcher(str).replaceAll(replacement)