How to make IgnoreCase when you're using the contain method

Question

I'm trying to make it ignore the cases, while using the contain method. How do I do that?

String text = "Did you eat yet?";   

if(text.contains("eat") && text.contains("yet"))
    System.out.println("Yes");
else
    System.out.println("No.");

Answer 1

Please use

 org.apache.commons.lang3.StringUtils.containsIgnoreCase("ABCDEFGHIJKLMNOP", "gHi");

Answer 2

Unfortunately there's no String.containsIgnoreCase method of String.

However, you can verify a similar condition with regular expressions.

For instance:

String text = "Did you eat yet?";
// will match a String containing both words "eat", 
// then "yet" in that order of appearance, case-insensitive
//                           | word boundary
//                           |        | any character, zero or more times 
Pattern p = Pattern.compile("\\beat\\b.*\\byet\\b", Pattern.CASE_INSENSITIVE);
Matcher m = p.matcher(text);
System.out.println(m.find());

Simpler version (thanks blgt):

// here we match the whole String, so we need start-of-input and 
// end-of-input delimiters
//                               | case-insensitive flag
//                               |   | beginning of input
//                               |   |                        | end of input
System.out.println(text.matches("(?i)^.*\\beat\\b.*\\byet\\b.*$"));

Output

true