Java best way for string find and replace

Question

I m looking for the best approach for string find and replace in Java   This is a sentence   My name is Milan  people know me as Milan Vasic     I want to replace the string Milan with Milan Vasic  but on place where I have already Milan Vasic  that shouldn t be a case   after search replace result should be   My name is Milan Vasic  people know me as Milan Vasic     I was try to use indexOf   and also Pattern Matcher combination  but neither of my results not looks elegant  does someone have elegant solution   cheers

User · Answer

One possibility  reducing the longer form before expanding all   string replaceAll  Milan Vasic    Milan   replaceAll  Milan    Milan Vasic     Another way  treating Vasic as optional   string replaceAll  Milan  Vasic      Milan Vasic     Others have described solutions based on lookahead or alternation

User · Answer

you can use pattern matcher as well  which will replace all in one shot   Pattern keyPattern   Pattern compile key       Matcher matcher   keyPattern matcher str       String nerSrting    matcher replaceAll value

User · Answer

Well  you can use a regular expression to find the cases where  Milan  isn t followed by  Vasic    Milan    Vasic    and replace that by the full name   String replaceAll  Milan    Vasic     Milan Vasic     The         part is a negative lookahead which ensures that whatever matches isn t followed by the part in parentheses  It doesn t consume any characters in the match itself   Alternatively  you can simply insert  well  technically replacing a zero-width match  the last name after the first name  unless it s followed by the last name already  This looks similar  but uses a positive lookbehind as well      lt  Milan     Vasic    You can replace this by just   Vasic   note the space at the start of the string    String replaceAll     lt  Milan     Vasic      Vasic     You can try those things out here for example

User · Answer

When you dont want to put your hand yon regular expression  may be you should  you could first replace all  Milan Vasic  string with  Milan    And than replace all  Milan  Strings with  Milan Vasic

User · Answer

Try this   public static void main String   args        String str    My name is Milan  people know me as Milan Vasic         Pattern p   Pattern compile   Milan     Vasic         Matcher m   p matcher str        StringBuffer sb   new StringBuffer         while m find              m appendReplacement sb   Milan Vasic               m appendTail sb       System out println sb

User · Answer

Another option    My name is Milan  people know me as Milan Vasic       replaceAll  Milan Vasic Milan    Milan Vasic

User · Answer

Simply include the Apache Commons Lang JAR and use the org apache commons lang StringUtils class  You ll notice lots of methods for replacing Strings safely and efficiently   You can view the StringUtils API at the previously linked website       Don t reinvent the wheel

[java] Java best way for string find and replace?

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