How can I tell if the substring "template" (for example) exists inside a String object?
It would be great if it was not a case-sensitive check.
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5 Answers
For a case insensitive search, to toUpperCase or toLowerCase on both the original string and the substring before the indexOf
String full = "my template string";
String sub = "Template";
boolean fullContainsSub = full.toUpperCase().indexOf(sub.toUpperCase()) != -1;
2 Comments
Michael Myers
+1 and I'm deleting my answer. Yours is better for both parts of the question.
siukurnin
Of course if you plan to do a lot of comparisons don't forget to store an upper cased version of he most used string
Use a regular expression and mark it as case insensitive:
if (myStr.matches("(?i).*template.*")) {
// whatever
}
The (?i) turns on case insensitivity and the .* at each end of the search term match any surrounding characters (since String.matches works on the entire string).
2 Comments
siukurnin
I love regexes but its a bit overkill in that case
Syed Muhammad Mubashir
@CoverosGene when i added this code to search one column in my jtable then this code works perfect but has one issue that instead of searching the top most elements of String bit searches the down most elements first? Can you tell me what the wrong i am doing ???
You can use indexOf() and toLowerCase() to do case-insensitive tests for substrings.
String string = "testword";
boolean containsTemplate = (string.toLowerCase().indexOf("template") >= 0);
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String word = "cat";
String text = "The cat is on the table";
Boolean found;
found = text.contains(word);
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public static boolean checkIfPasswordMatchUName(final String userName, final String passWd) {
if (userName.isEmpty() || passWd.isEmpty() || passWd.length() > userName.length()) {
return false;
}
int checkLength = 3;
for (int outer = 0; (outer + checkLength) < passWd.length()+1; outer++) {
String subPasswd = passWd.substring(outer, outer+checkLength);
if(userName.contains(subPasswd)) {
return true;
}
if(outer > (passWd.length()-checkLength))
break;
}
return false;
}
1 Comment
Raj
this will check if minimum 3 characters of substring (paswd) is contains in another string (Username)