Extract substring from a string

Question

what is the best way to extract a substring from a string in android

User · Answer

use text untold class from android   TextUtils substring  charsequence source  int start   int end

User · Answer

There is another way   if you want to  get sub string before and after a character  String s   123dance456   String   split   s split  dance    String firstSubString   split 0   String secondSubString   split 1     check this post-  how to find before and after sub-string in a string

User · Answer

Here is a real world example   String hallostring    hallo   String asubstring   hallostring substring 0  1      In the example asubstring would return  h

User · Answer

The best way to get substring in Android is using  as  user2503849 said  TextUtlis substring CharSequence  int  int  method  I can explain why  If you will take a look at the String substring int  int  method from android jar  newest API 22   you will see   public String substring int start        if  start    0            return this            if  start  gt   0  amp  amp  start  lt   count            return new String offset   start  count - start  value             throw indexAndLength start       Ok  than    How do you think the private constructor String int  int  char    looks like   String int offset  int charCount  char   chars        this value   chars      this offset   offset      this count   charCount      As we can see it keeps reference to the  old  value char   array  So  the GC can not free it   In the newest Java it was fixed   String int offset  int charCount  char   chars        this value   Arrays copyOfRange chars  offset  offset   charCount       this offset   offset      this count   charCount      Arrays copyOfRange      uses native array copying inside   That s it     Best regards

User · Answer

substring int startIndex  int endIndex       If you don t specify endIndex  the method will return all the   characters from startIndex       startIndex   starting index is inclusive      endIndex   ending index is exclusive   Example   String str    abcdefgh   str substring 0  4     abcd  str substring 4  6     ef  str substring 6     gh

User · Answer

You can use subSequence   it s same as substr in C   Str subSequence int Start   int End

User · Answer

If you know the Start and End index  you can use   String substr mysourcestring substring startIndex endIndex     If you want to get substring from specific index till end you can use    String substr mysourcestring substring startIndex     If you want to get substring from specific character till end you can use    String substr mysourcestring substring mysourcestring indexOf  characterValue       If you want to get substring from after a specific character  add that number to  indexOf char    String substr mysourcestring substring mysourcestring indexOf  characterValue     1

User · Answer

substring      str substring startIndex  endIndex

User · Answer

you can use this code      public static String getSubString String mainString  String lastString  String startString        String endString           int endIndex   mainString indexOf lastString       int startIndex   mainString indexOf startString       Log d  message        mainString substring startIndex  endIndex        endString   mainString substring startIndex  endIndex       return endString      in this mainString is a Super string like   I AmANDROID Devloper  and lastString is a string like    and startString is like     so this function returns  AmANDROID   enjoy your code time

User · Answer

When finding multiple occurrences of a substring matching a pattern       String input string    foo adsfasdf adf bar erqwer        String regex     foo  bar        Matches  foo   and  bar        Pattern pattern   Pattern compile regex       Matcher matcher   pattern matcher input string        while matcher find            String str matched   input string substring matcher start    matcher end                Do something with a match found

[android] Extract substring from a string

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