CODEWITHSUNDEEP
javastringreplace
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Reputation: 1179

Replace case insenstive in string

I have a file and i converted that file into string. Now whenever i am trying to replace some camelcase data like 'fooBar' with lowercase data like 'foobar' then it is not working.

I tried these 2 cases.

   String target = "fooBar and tooohh";
  target = target.replace("foobar", "");
   System.out.println(target);

Its giving me this output fooBar and tooohh

Then I tried this 

String target123 = "fooBar and tooohh";
target123=target123.replace("(?i)foobar", "") ;
System.out.println(target123);

and this also giving me same output : - fooBar and tooohh

Upvotes: 0

Views: 125

Answers (6)

Ruudt
Ruudt

Reputation: 870

You are replacing the string "foobar" which is not in "fooBar and tooohh". replace is case sensitive, so if you would want to replace "fooBar" with "" (nothing), you'd use:

string target = "fooBar and tooohh";
target = target.replace("fooBar", "");

This would return: 

" and tooohh"

However, you've asked to lowercase all the camelcased words in which case you would do this:

string target = "fooBar and tooohh";
target = target.toLowerCase();

returns:

"foobar and tooohh"

Upvotes: 1

Ilya
Ilya

Reputation: 29703

Use String::replaceAll or String::replaceFirst method and regex (?i)foobar

 String replaced = target.replaceAll("(?i)foobar", "");

or 

String replaced = target.replaceFirst("(?i)foobar", "");

Method String::replace cann't be used with regex

Upvotes: 2

JEY
JEY

Reputation: 7133

As told by other String is immutable so you need to reassigne.

target = target.replace("foobar", "");

With String.replaceAll you can use a regex so for your needs:

target = target.replaceAll("(?i)foobar", "");

If you want to set all the string to lowercase then use String.toLowerCase

target = target.toLowerCase();

Upvotes: 1

blackpanther
blackpanther

Reputation: 11486

String#toLowerCase is your answer to the problem.

Upvotes: 0

stinepike
stinepike

Reputation: 54722

Just use String.toLowerCase method

So if you want to make whole string lower case you can do like

String result = test.toLowerCase();

Now if you only want to make the fooBar to lower case you can do somethinglike

String temp = "fooBar";
String result = test.replace(temp,temp.toLowerCase());

[Just tried to give a concept]

Upvotes: 1

Quirin
Quirin

Reputation: 738

It is because String is immutable in java, so if you want to change a String with replace() method you have to reassigne your variable like this:

target = target.replace("foobar", "");

Upvotes: 0

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