How to replace special characters in a string

Question

I have a string with lots of special characters  I want to remove all those  but keep alphabetical characters   How can I do this

User · Answer

For spaces use    a-z A-Z 0-9   this pattern

User · Answer

You can get unicode for that junk character from charactermap tool in window pc and add  u e g   u00a9 for copyright symbol  Now you can use that string with that particular junk caharacter  don t remove any junk character but replace with proper unicode

User · Answer

Replace any special characters by  replaceAll    your special character   new character      ex to replace all the occurrence of   with white space   replaceAll               this statement can only replace one type of special character at a time

User · Answer

string Output   Regex Replace Input       a-zA-Z0-9 amp        s           Here all the special characters except space  comma  and ampersand are replaced  You can also omit space  comma and ampersand by the following regular expression   string Output   Regex Replace Input       a-zA-Z0-9     s           Where Input is the string which we need to replace the characters

User · Answer

Following the example of the Andrzej Doyle s answer  I think the better solution is to use org apache commons lang3 StringUtils stripAccents     package bla bla utility   import org apache commons lang3 StringUtils   public class UriUtility       public static String normalizeUri String s            String r   StringUtils stripAccents s           r   r replace                    r   r replaceAll       A-Za-z0-9                  return r

User · Answer

That depends on what you mean  If you just want to get rid of them  do this   Update  Apparently you want to keep digits as well  use the second lines in that case   String alphaOnly   input replaceAll    a-zA-Z         String alphaAndDigits   input replaceAll    a-zA-Z0-9           or the equivalent   String alphaOnly   input replaceAll      p Alpha          String alphaAndDigits   input replaceAll      p Alpha   p Digit             All of these can be significantly improved by precompiling the regex pattern and storing it in a constant   Or  with Guava   private static final CharMatcher ALNUM     CharMatcher inRange  a    z   or CharMatcher inRange  A    Z       or CharMatcher inRange  0    9    precomputed           String alphaAndDigits   ALNUM retainFrom input     But if you want to turn accented characters into something sensible that s still ascii  look at these questions    Converting Java String to ASCII Java change     ou   to aeouu n   n      n                    --  n or Remove diacritical marks from unicode chars

User · Answer

You can use the following method to keep alphanumeric characters   replaceAll    a-zA-Z0-9           And if you want to keep only alphabetical characters use this  replaceAll    a-zA-Z

User · Answer

I am using this    s   s replaceAll    W           It replace all special characters from string   Here    w   A word character  short for  a-zA-Z 0-9    W    A non-word character

User · Answer

You can use basic regular expressions on strings to find all special characters or use pattern and matcher classes to search modify delete user defined strings  This link has some simple and easy to understand examples for regular expressions  http   www vogella de articles JavaRegularExpressions article html

User · Answer

Here is a function I used to remove all possible special characters from the string let name   name replace    amp                    quot            lt  gt                       g      toLowerCase

[java] How to replace special characters in a string?

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