How to parse this string in Java

Question

prefix dir1 dir2 dir3 dir4      How to parse the dir1  dir2 values out of the above string in Java   The prefix here can be    usr local apache2 resumes

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String result   String str     usr local apache2 resumes dir1 dir2 dir3 dir4    String regex    dir     d     Matcher matcher   Pattern compile  regex   matcher  str     while  matcher find           result   matcher group           System out println result                        output--  dir1 dir2 dir3 dir4

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If it s a File  you can get the parts by creating an instanceof File and then ask for its segments   This is good because it ll work regardless of the direction of the slashes  it s platform independent  except for the  drive letters  in windows

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public class Test       public static void main String args          String s    pre fix dir1 dir2 dir3 dir4          String prefix    pre fix       String   tokens   s substring prefix length    split           for  int i 0  i lt tokens length  i              System out println tokens i

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String split String regex  is convenient but if you don t need the regular expression handling then go with the substring     example  java util StringTokenizer or use Apache commons lang 1   The performance difference when not using regular expressions can be a gain of 1 to 2 orders of magnitude in speed

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Using String split method will surely work as told in other answers here   Also  StringTokenizer class can be used to to parse the String using   as the delimiter   import java util StringTokenizer  public class Test       public static void main String   args                String s    prefix dir1 dir2 dir3 dir4              StringTokenizer tokenizer   new StringTokenizer s                String dir1   tokenizer nextToken            String dir2   tokenizer nextToken            System out println  Dir 1      dir1           System out println  Dir 2       dir2             Gives the output as     Dir 1    prefix Dir 2   dir1   Here you can find more about StringTokenizer

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String str     usr local apache resumes dir1 dir2   String prefix     usr local apache resumes     if  str startsWith prefix        str   str substring 0  prefix length     String parts     str split            dir1 parts 0        dir2 parts 1     else        It doesn t start with your prefix

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In this case  why not use new File  prefix dir1 dir2 dir3 dir4   and go from there

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String s    prefix dir1 dir2 dir3 dir4   String parts     s split        System out println s 0        prefix  System out println s 1        dir1

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If you want to split the String at the   character  the String split method will work   For example   String s    prefix dir1 dir2 dir3 dir4   String   tokens   s split        for  String t   tokens    System out println t     Output  prefix dir1 dir2 dir3 dir4   Edit  Case with a   in the prefix  and we know what the prefix is   String s    slash prefix dir1 dir2 dir3 dir4    String prefix    slash prefix    String noPrefixStr   s substring s indexOf prefix    prefix length      String   tokens   noPrefixStr split        for  String t   tokens    System out println t     The substring without the prefix  slash prefix   is made by the substring method  That String is then run through split   Output   dir1 dir2 dir3 dir4   Edit again  If this String is actually dealing with file paths  using the File class is probably more preferable than using string manipulations  Classes like File which already take into account all the intricacies of dealing with file paths is going to be more robust

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String str    bla  bla bla    String parts     str split          To get fist  bla   String dir1   parts 0

[java] How to parse this string in Java?

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