check if substrings letters are in string code example
Example 1: check if string contains substring
Like this:
if (str.indexOf("Yes") >= 0)
...or you can use the tilde operator:
if (~str.indexOf("Yes"))
This works because indexOf() returns -1 if the string wasn't found at all.
Note that this is case-sensitive.
If you want a case-insensitive search, you can write
if (str.toLowerCase().indexOf("yes") >= 0)
Or:
if (/yes/i.test(str))
Example 2: how to check if a string contains a character
public static boolean containsIgnoreCase(String str, char c) {
str = str.toLowerCase();
for (int i = 0; i < str.length(); i++) {
if (str.charAt(i) == Character.toLowerCase(c)) {
return true;
}
}
return false;
}