How to get a string between two characters

Question

I have a string   String s    test string  67      I want to get the no 67 which is the string between   and     Can anyone please tell me how to do this

User · Answer

String s    test string  67     System out println s substring s indexOf      1 s indexOf

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This is a simple use  D  regex and job done   This select all chars except digits  no need to complicate   D

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Java supports Regular Expressions  but they re kind of cumbersome if you actually want to use them to extract matches  I think the easiest way to get at the string you want in your example is to just use the Regular Expression support in the String class s replaceAll method   String x    test string  67   replaceAll                        x is now the String  67    This simply deletes everything up-to-and-including the first    and the same for the   and everything thereafter  This just leaves the stuff between the parenthesis   However  the result of this is still a String  If you want an integer result instead then you need to do another conversion   int n   Integer parseInt x      n is now the integer 67

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There s probably a really neat RegExp  but I m noob in that area  so instead     String s    test string  67     s   s substring s indexOf        1   s   s substring 0  s indexOf         System out println s

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By using regular expression     String s    test string  67     Pattern p   Pattern compile                Matcher m   p matcher s    if m find        System out println m group   subSequence 1  m group   length  -1

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public String getStringBetweenTwoChars String input  String startChar  String endChar        try           int start   input indexOf startChar           if  start    -1                int end   input indexOf endChar  start   startChar length                 if  end    -1                    return input substring start   startChar length    end                                 catch  Exception e            e printStackTrace              return input     return null     return          Usage    String input    test string  67    String startChar        String endChar          String output   getStringBetweenTwoChars input  startChar  endChar   System out println output      Output   67

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The other possible solution is to use lastIndexOf where it will look for character or String from backward   In my scenario  I had following String and I had to extract  lt  lt UserName gt  gt   1QAJK-WKJSH MyApplication Extract  lt  lt UserName gt  gt  arc   So  indexOf and StringUtils substringBetween was not helpful as they start looking for character from beginning   So  I used lastIndexOf  String str    1QAJK-WKJSH MyApplication Extract  lt  lt UserName gt  gt  arc   String userName   str substring str lastIndexOf        1  str lastIndexOf          And  it gives me    lt  lt UserName gt  gt

User · Answer

You could use apache common library s StringUtils to do this    import org apache commons lang3 StringUtils      String s    test string  67    s   StringUtils substringBetween s

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Something like this   public static String innerSubString String txt  char prefix  char suffix         if txt    null  amp  amp  txt length    gt  1             int start   0  end   0          char token          for int i   0  i  lt  txt length    i                  token   txt charAt i               if token    prefix                  start   i              else if token    suffix                  end   i                     if start   1  lt  end              return txt substring start 1  end               return null

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it will return original string if no match regex var iAm67    quot test string  67  quot  replaceFirst  quot test string            quot    quot  1 quot     add matches to the code String str    quot test string  67  quot   String regx    quot test string            quot   if  str matches regx         var iAm67   str replaceFirst regx   quot  1 quot       ---EDIT--- i use https   www freeformatter com java-regex-tester html ad-output to test regex  turn out it s better to add   after   for less match  something like this  String str    quot test string  67  69  quot   String regx1    quot test string              quot   String regx2    quot test string               quot   String ans1   str replaceFirst regx1   quot  1 quot    String ans2   str replaceFirst regx2   quot  1 quot    System out println  quot ans1  quot  ans1  quot  nans2  quot  ans2       ans1 67  69    ans2 67

User · Answer

A very useful solution to this issue which doesn t require from you to do the indexOf is using Apache Commons libraries    StringUtils substringBetween s               This  method will allow you even handle even if there multiple occurrences of the closing string which wont be easy by looking for indexOf closing string   You can download this library from here  https   mvnrepository com artifact org apache commons commons-lang3 3 4

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Another way of doing using split method  public static void main String   args          String s    test string  67        String   ss      ss  s split             ss   ss 1  split              System out println ss 0

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String result   s substring s indexOf        1  s indexOf

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Use Pattern and Matcher     public class Chk        public static void main String   args             String s    test string  67            ArrayList lt String gt  arL   new ArrayList lt String gt             ArrayList lt String gt  inL   new ArrayList lt String gt              Pattern pat   Pattern compile       w                Matcher mat   pat matcher s            while  mat find                   arL add mat group                 System out println mat group                         for  String sx   arL                 Pattern p   Pattern compile     w                  Matcher m   p matcher sx                while  m find                       inL add m group                     System out println m group                                      System out println inL

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String s    test string  67     int start   0         position in string int end   0         position in string for int i   0  i  lt  s length    i           if s charAt i             Looking for     position in string        start   i      else if s charAt i             Looking for     position in  string        end   i    String number   s substring start 1  end      you take value between start and end

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Test String test string  67  from which you need to get the String which is nested in-between two Strings   String str    test string  67  and  77    open        close          Listed some possible ways  Simple Generic Solution   String subStr   str substring str indexOf  open     1  str indexOf  close     System out format  String  s  Parsed IntValue  d  n   subStr  Integer parseInt  subStr            Apache Software Foundation commons lang3    StringUtils class substringBetween   function gets the String that is nested in between two Strings  Only the first match is returned   String substringBetween   StringUtils substringBetween subStr  open  close   System out println  Commons Lang3      substringBetween     Replaces the given String  with the String which is nested in between two Strings   395       Pattern with Regular-Expressions                    The Dot Matches  Almost  Any Character         0 1          0           1    String patternMatch   patternMatch generateRegex open  close   str   System out println  Regular expression Value      patternMatch     Regular-Expression with the utility class RegexUtils and some functions   nbsp  nbsp  nbsp  nbsp  nbsp  Pattern DOTALL  Matches any character  including a line terminator   nbsp  nbsp  nbsp  nbsp  nbsp  Pattern MULTILINE  Matches entire String from the start  till end  of the input sequence   public static String generateRegex String open  String close        return       RegexUtils escapeQuotes open                RegexUtils escapeQuotes close              public static String patternMatch String regex  CharSequence string        final Pattern pattern    Pattern compile regex  Pattern DOTALL       final Matcher matcher   pattern  matcher string        String returnGroupValue   null      if  matcher find         while     Pattern MULTILINE           System out println  Full match      matcher group 0            System out format  Character Index  Start End     d  d  n  matcher start   matcher end             for  int i   1  i  lt   matcher groupCount    i                  System out println  Group     i          matcher group i                if  i    2   returnGroupValue   matcher group  2                        return returnGroupValue

User · Answer

The  generic  way of doing this is to parse the string from the start  throwing away all the characters before the first bracket  recording the characters after the first bracket  and throwing away the characters after the second bracket   I m sure there s a regex library or something to do it though

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In a single line  I suggest   String input    test string  67    input   input subString input indexOf      1  input lastIndexOf        System out println input

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Try it like this  String s  test string 67    String requiredString   s substring s indexOf        1  s indexOf          The method s signature for substring is   s substring int start  int end

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The least generic way I found to do this with Regex and Pattern   Matcher classes   String text    test string  67     String START              A literal     character in regex String END                A literal     character in regex     Captures the word s  between the above two character s  String pattern   START      w      END   Pattern pattern   Pattern compile pattern   Matcher matcher   pattern matcher text    while matcher find          System out println matcher group            replace START      replace END            This may help for more complex regex problems where you want to get the text between two set of characters

[java] How to get a string between two characters?

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