How to remove special characters from a string

Question

I want to remove special characters like   -             from an String using Java

User · Answer

You can remove single char as follows   String str   919595354336     String result   str replaceAll                System out println result     OUTPUT   919595354336

User · Answer

To Remove Special character  String t2           amp    -       gt  lt  abdd    t2   t2 replaceAll    W          Output will be   abdd   This works perfectly

User · Answer

Use the String replaceAll   method in Java   replaceAll should be good enough for your problem

User · Answer

That depends on what you define as special characters  but try replaceAll        String result   yourString replaceAll   -               Note that the   character must not be the first one in the list  since you d then either have to escape it or it would mean  any but these characters    Another note  the - character needs to be the first or last one on the list  otherwise you d have to escape it or it would define a range   e g   -  would mean  all characters in the range   to      So  in order to keep consistency and not depend on character positioning  you might want to escape all those characters that have a special meaning in regular expressions  the following list is not complete  so be aware of other characters like          etc     String result   yourString replaceAll     -                      If you want to get rid of all punctuation and symbols  try this regex   p P  p S   keep in mind that in Java strings you d have to escape back slashes     p P   p S      A third way could be something like this  if you can exactly define what should be left in your string   String  result   yourString replaceAll      w  s          This means  replace everything that is not a word character  a-z in any case  0-9 or    or whitespace   Edit  please note that there are a couple of other patterns that might prove helpful  However  I can t explain them all  so have a look at the reference section of regular-expressions info   Here s less restrictive alternative to the  define allowed characters  approach  as suggested by Ray   String  result   yourString replaceAll      p L   p Z           The regex matches everything that is not a letter in any language and not a separator  whitespace  linebreak etc    Note that you can t use   P L  P Z    upper case P means not having that property   since that would mean  everything that is not a letter or not whitespace   which almost matches everything  since letters are not whitespace and vice versa   Additional information on Unicode  Some unicode characters seem to cause problems due to different possible ways to encode them  as a single code point or a combination of code points   Please refer to regular-expressions info for more information

User · Answer

If you just want to do a literal replace in java  use Pattern quote string  to escape any string to a literal   myString replaceAll Pattern quote matchingStr   replacementStr

User · Answer

Try replaceAll   method of the String class   BTW here is the method  return type and parameters   public String replaceAll String regex                           String replacement    Example   String str    Hello  -  my   - friends     --          str   str replaceAll   -              It should remove all the             -   chars that you wanted to remove

User · Answer

This will replace all the  characters except alphanumeric   replaceAll    A-Za-z0-9

User · Answer

As described here http   developer android com reference java util regex Pattern html     Patterns are compiled regular expressions  In many cases  convenience methods such as String matches  String replaceAll and String split will be preferable  but if you need to do a lot of work with the same regular expression  it may be more efficient to compile it once and reuse it  The Pattern class and its companion  Matcher  also offer more functionality than the small amount exposed by String    public class RegularExpressionTest    public static void main String   args        System out println  String is     getOnlyStrings    amp         one  amp           amp            amp              System out println  Number is     getOnlyDigits   amp         91- amp  9hi-639-0097  amp             public static String getOnlyDigits String s        Pattern pattern   Pattern compile    0-9         Matcher matcher   pattern matcher s       String number   matcher replaceAll          return number      public static String getOnlyStrings String s        Pattern pattern   Pattern compile    a-z A-Z         Matcher matcher   pattern matcher s       String number   matcher replaceAll          return number         Result  String is   one Number is   9196390097

[java] How to remove special characters from a string?

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