Can we check if string contains in another string with case insensitive?

Question

I want to check if string contains in another string but in case insensitive manner.

for example - "Kabir" contains in "Dr.kabir's house.". Now "Kabir" with capital K should find in "Dr.kabir's house." with or without spaces in this sentence.

I tried to use contains. But contains() is case sensitive, I also tried to use equalsIgnoreCase() but its not useful.

       for (int i = 0; i < itemsList.size(); i++) {
        if (matching.contains(itemsList.get(i))) {
            item = itemsList.get(i).trim();
            break;
        }
    }

Also tried this by making string uppercase but it checks for all the letters as Uppercase. I want to check if only initial letter is capital.

   for (int i = 0; i < itemsList.size(); i++) {
        if (matching.contains(itemsList.get(i))) {
            item = itemsList.get(i).trim();
            break;
        }
    }

Can anyone help with this please? Thank you..

EDIT : If I want to split "kabir" from the string how to do it?

duplicate of this I think, http://stackoverflow.com/questions/14972299/how-to-use-contains-and-equalsignorecase-in-string — msagala25, Dec 13 '16 at 04:59

score 4 · Accepted Answer · answered Dec 13 '16 at 04:58

4

Just lowercase both strings and then use contains():

for (int i = 0; i < itemsList.size(); i++) {
    if (matching.toLowerCase().contains(itemsList.get(i).toLowerCase())) {
        item = itemsList.get(i).trim();
        break;
    }
}

answered Dec 13 '16 at 04:58

Tim Biegeleisen

502,043
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I have tried this. But this checks for either all the lower case letters or upper case letters. but what if one word is uppercase and others are small like "Kabir"? – Sid Dec 13 '16 at 04:59
1

@Sid My solution, as well as the other answers, convert _both_ strings to lowercase, so the case no longer matters, only the letters. Does this make sense? – Tim Biegeleisen Dec 13 '16 at 05:00
as an additional, String is immutable. so It will not change the `matching` String unless you assigned the lowercase value to it. – msagala25 Dec 13 '16 at 05:03
how can I split "kabir" from the string? @TimBiegeleisen – Sid Dec 13 '16 at 06:11
@Sid You can try using a combination of `String#indexOf` and `String#substring` to isolate the string around the substring `kabir`. – Tim Biegeleisen Dec 13 '16 at 06:25

score 3 · Answer 2 · answered Dec 13 '16 at 04:57

3

Just convert both strings to either lower or upper case first before using .contains() method.

For example:

if (str1.toLowerCase().contains(str2.toLowerCase()))
    //do whatever

answered Dec 13 '16 at 04:57

user3437460

17,253
15
58
106

I have tried this. But this checks for either all the lower case letters or upper case letters. but what if one word is uppercase and others are small like "Kabir"? – Sid Dec 13 '16 at 05:00
@Sid It will still work, because you convert both strings before performing the match. So neither strings will contain any upper case letter before the check. – user3437460 Dec 13 '16 at 05:01

Scary Wombat · Answer 3 · 2016-12-13T05:00:21.843

2

make both strings lower (or upper) case

String one = "test";
String two = "TESTY";

if (two.toLowerCase ().contains (one.toLowerCase ())) {
    System.out.println ("Yep");
}
else {
    System.out.println ("Nope");
}

edited Dec 13 '16 at 05:00

answered Dec 13 '16 at 04:58

Scary Wombat

44,617
6
35
64

I have tried this. But this checks for either all the lower case letters or upper case letters. but what if one word is uppercase and others are small like "Kabir"? – Sid Dec 13 '16 at 05:00
this is making both words lowercase – Scary Wombat Dec 13 '16 at 05:00

Can we check if string contains in another string with case insensitive?

3 Answers3