replaceall

Hi I'd like to replace a char in a String. My problem is that at first you don't know which char it is, so in some cases I get an error message when my char is for example '+'. I don't want my char being interpreted as regex, so what should I do? May code should be something like this: String test = "something"; char ca = input.chatAt(0); input = input.replaceAll("" + ca, ""); I hope you can help me. Just don't use regex then. input = input.replace(String.valueOf(ca), ""); The replaceAll method of String takes the String representation of a regular expression as an argument. The replace method

Javadoc says $1, $2, etc. can be used to reference the match groups, but how does one reference the latest found group in the replacement string when using String.replaceAll() ? I.e. there's a string "aaabbbaa" and a regex "a+" , and I want to be able to do something like s.replaceAll("a+", "$\n") to get "aaa\nbbbaa\n" , but Java gives me the Illegal group reference . s.replaceAll("(a+)", "$1\n") should work: jshell> String s = "aaabbbaa" s ==> "aaabbbaa" jshell> s.replaceAll("(a+)", "$1\n") $2 ==> "aaa\nbbbaa\n" As pointed out in the comments already, you'll have to mark the capture group in

I need to remove some substrings in strings (in a large dataset). The substrings often contain special characters, like these: ., ^, /,... and replaceAll() would treat them as special characters for regex, such as a dot would match any character, which is not really what I want. Is there other functions to do the "replace" without treating the first argument as regex? Just use String.replace(). It functions the same way, but it deals with escaping the special characters internally to avoid you having to worry about regex. Documentation You can match literally. For instance, if we want to match

I'm doing something like public static String[] list = {"a","b","c","d",} //It gives me a NullPointeException if I didn't use static public String encrypt(String a){ a = a.replace(list[0],list[2]); a = a.replace(list[4],list[3]); return a; } and I have another method that just reverses it public String decrypt(String a){ a = a.replace(list[2],list[0]); a = a.replace(list[3],list[4]); return a; } Of course this is simplified, the real code I'm using uses the entire alphabet and some numbers. So here's my problem: If I input something like 123 into encrypt() and it outputs ngV then I input ngV

I'm actually developping a parser and I'm stuck on a method. I need to clean specifics words in some sentences, meaning replacing those by a whitespace or a null character. For now, I came up with this code: private void clean(String sentence) { try { FileInputStream fis = new FileInputStream( ConfigHandler.getDefault(DictionaryType.CLEANING).getDictionaryFile()); BufferedReader bis = new BufferedReader(new InputStreamReader(fis)); String read; List<String> wordList = new ArrayList<String>(); while ((read = bis.readLine()) != null) { wordList.add(read); } } catch (IOException e) { e

Here is the scenario. String strText = "ABC abc Abc aBC abC aBc ABc AbC"; // Adding a HTML content to this String searchText = "abc"; String strFormatted = strText.replaceAll( "(?i)" + searchText, "<font color='red'>" + searchText + "</font>"); This returns a string with all the words in lower case and of course in red color. My requirement is to get the strFormatted as a String with the case same as Original String but it should have the Font tag. Is it possible to do this ? You can use a backreference. Something like: String strFormatted = strText.replaceAll( "(?i)(" + searchText + ")", "

I am wondering about why I don't get the expected result with this one: String t = "1302248663033 <script language='javascript'>nvieor\ngnroeignrieogi</script>"; t.replaceAll("\n", ""); System.out.println(t); The output is: 1302248663033 <script language='javascript'>nvieor gnroeignrieogi</script> So I am wondering why \n is still there. Anybody knows? Is \n special in someway? EDIT: So I was having trouble with matching the newline character with a . in a regex expression, not realizing that one use to use the DOTALL option, so I'll add what one needs to do here for future reference: String