How to do a case-insensitive string replacement

Question

Hi friends I'm creating an app.
I want to find a particular word in an ArrayList and I have to replace
it with another word. I used the code below. It works case sensitive,
but I'd like to get it working case insensitive.

 FillintheBlank.class: public class FillintheBlank extends Activity { static ArrayList<String> multiword=new ArrayList<String>(); static ArrayList<String> multimeaning=new ArrayList<String>(); public void setNoTitle() { requestWindowFeature(Window.FEATURE_NO_TITLE); } float screenHeight,screenWidth,screendensity; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setNoTitle(); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); DisplayMetrics displaymetrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(displaymetrics); screenHeight = displaymetrics.heightPixels; screenWidth = displaymetrics.widthPixels; screendensity = displaymetrics.densityDpi; setContentView(R.layout.fillinblanknew); multiword.add("radha"); multiword.add("RAdHA"); multiword.add("latha"); multiword.add("mammu"); s.o.p(""+multiword); // output:radha,RADHA,latha,mamu multimeaning.add(multiword.getString().replace(radha,"sai")); s.o.p(""+multimeaning); // output: sai,RADHA,latha,mamu } }

For example: I need to replace 'radha' with 'sai' no matter what the case of the letters in 'radha' are.

And another example on StackOverflow: stackoverflow.com/questions/5054995/… — TimothyP
– TimothyP, Commented Mar 25, 2013 at 11:11
Is this your actual working code? How are you doing a getString() on an ArrayList? — Alex Florescu
– Alex Florescu, Commented Mar 25, 2013 at 11:21

Alex Florescu · Accepted Answer · 2013-03-25 11:24:10Z

12

Could use a regular expression. Just add (?i) before your string to ignore case.

So for example:

multiword.getString().replaceAll ( "(?i)radha", "sai");

edited Mar 25, 2013 at 11:24

answered Mar 25, 2013 at 11:03

Alex Florescu

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1 Comment

Alex Florescu Over a year ago

You're right, I don't think replace takes a regex, only replaceAll and replaceFirst

Muhammed Refaat · Accepted Answer · 2017-05-18 11:21:35Z

You can "(?i)" pattern in front of a string to ignore the case.

public class StringReplace { public static void main(String[] args) { System.out.println(replaceString("This is a FISH", "IS")); } public static String replaceString(String first, String second) { return first.replaceAll("(?i)"+ second, ""); } }

The code above will return "Th a FH".

Naor Bar · Accepted Answer · 2018-02-18 07:54:06Z

Use StringUtils by apache commons lang3 - v3.5 or later (so you don't have to worry about regular expression parsing):

StringUtils.replaceIgnoreCase(text, searchString, replacement);

or:

StringUtils.replaceOnceIgnoreCase(text, searchString, replacement);

If you use maven, add this dependency (I'm using version 3.6):

<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 --> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.6</version> </dependency>

Rajitha Siriwardena · Accepted Answer · 2013-03-25 11:00:38Z

-4

You could use equalsIgnoreCase(string) method found in String class for your purpose.

answered Mar 25, 2013 at 11:00

Rajitha Siriwardena

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3 Comments

radha Over a year ago

yes i tried.please see my code once. first i need to search in arraylist that string is there or then i have to apply that equlasignore case() butin above code how to apply that method i didnt get any idea

MysticMagicϡ Over a year ago

@TimothyP OP wants insensitive case replace. Not equals. If I am wrong in downvoting, I will undo it. But I think the answer is not proper.

TimothyP Over a year ago

Well, his answer may have been better as a comment now that I think of it. You're correct

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