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Thread: Pattern, regex (regular expression) case sensitivity question

  1. #1
    Java kindergarten chronoz13's Avatar
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    Mar 2009
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    Default Pattern, regex (regular expression) case sensitivity question

    i have a clarification answer with a simple case sensitivity question with the code below

    import java.util.regex.Pattern;
    public class NewClass6 {
        public static void main(String[] args) {
            Pattern patt = Pattern.compile("[aeiou]", Pattern.CASE_INSENSITIVE);
            String temp = "A";
            if (temp.matches(patt.pattern())) {

    given that i already using Pattern class doing a bussiness with the Matcher(Pattern-matching),
    in this case the String object(temp) that refers to a string value doesnt matches the pattern even if it has been compiled in a

    is it because the statement patt.pattern() ONLY RETURNS a pattern, but the case sensitivity manner doesnt/cannot do anything?

  2. #2
    Super Moderator Sean4u's Avatar
    Join Date
    Jul 2011
    Tavistock, UK
    Thanked 103 Times in 93 Posts

    Default Re: Pattern, regex (regular expression) case sensitivity question

    is it because the statement patt.pattern() ONLY RETURNS a pattern
    Yes. You can include a case-insensitive switch in the pattern instead of using the separate flags int. See the 'Special constructs' in the API doc.

  3. The Following User Says Thank You to Sean4u For This Useful Post:

    chronoz13 (September 7th, 2011)

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