How to replace a substring of a string

Question

Assuming I have a String string like this    abcd 0  efgh 1    and I want to replace  abcd  by  dddd   I have tried to do such thing   string replaceAll  abcd   dddd      It does not work  Any suggestions    EDIT  To be more specific  I am working in Java and I am trying to parse the HTML document  concretely the content between  lt script gt  tags  I have already found a way how to parse this content into a string    if tag instanceof ScriptTag           if   ScriptTag  tag  getStringText   contains  DataVideo                 String tagText     ScriptTag tag  getStringText                Now I have to find a way how to replace one substring by another one

User · Answer

You need to create the variable to assign the new value to  like this   String str   string replaceAll  abcd   dddd

User · Answer

In javascript   var str    abcdaaaaaabcdaabbccddabcd   document write str replace   abcd  g  ----       example output  ----aaaaa----aabbccdd----   In other languages  it would be something similar  Remember to enable global matches

User · Answer

You are probably not assigning it after doing the replacement or replacing the wrong thing   Try    String haystack    abcd 0  efgh 1   String result   haystack replaceAll  abcd   dddd

User · Answer

2 things you should note    Strings in Java are immutable to so you need to store return value of thereplace method call in another String  You don t really need a regex here  just a simple call to String replace String  will do the job    So just use this code   String replaced   string replace  abcd    dddd

User · Answer

By regex i think this is java  the method replaceAll   returns a new String with the substrings replaced  so try this   String teste    abcd 0  efgh 1    String teste2   teste replaceAll  abcd    dddd     System out println teste2     Output   dddd 0  efgh 1

User · Answer

You need to use return value of replaceAll   method  replaceAll   does not replace the characters in the current string  it returns a new string with replacement         String objects are immutable  their values cannot be changed after they are created    You may use replace   instead of replaceAll   if you don t need regex           String str    abcd 0  efgh 1       String replacedStr   str replaceAll  abcd    dddd         System out println str       System out println replacedStr     outputs  abcd 0  efgh 1 dddd 0  efgh 1

User · Answer

Note that backslashes     and dollar signs     in the replacement   string may cause the results to be different than if it were being   treated as a literal replacement string  see   Matcher replaceAll    Use   Matcher quoteReplacement java lang String    to suppress the special meaning of these characters  if desired    from javadoc

[java] How to replace a substring of a string

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