Java method to get position of a match in a String

Question

String match    hello   String text    0123456789hello0123456789    int position   getPosition match  text      should be 10  is there such a method

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import java util StringTokenizer   public class Occourence      public static void main String   args        String key null str   my name noorus my name noorus               int i 0 tot 0       StringTokenizer st new StringTokenizer str           while st hasMoreTokens                     tot tot 1          key   st nextToken            while  i  str indexOf key i  1   gt 0                        System out println  position of   key      is    i-1                         System out println  total words present in string   tot

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Use string indexOf to get the starting index

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finding a particular word any where inthe string and printing its index and occurence   class IndOc       public static void main String   args                 String s  this is hyderabad city and this is           System out println  the given string is             System out println  ----------  s           char ch   s toCharArray            System out println   ----word is found at             int j 0 noc 0          for int i 0 i lt ch length i                          j i               if ch i    i   amp  amp  ch j 1    s                                 System out println   index   i               noc                                       System out println  ----- no of occurences are   noc

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public int NumberWordsInText String FullText   String WordToFind   int   positions            int iii1 0      int iii2 0      int iii3 0      while  iii1  FullText  indexOf WordToFind  iii1  1   gt 0  iii2 iii2 1          iii2 is the number of the occurences     if iii2 gt 0            positions    new int iii2           while   iii1    FullText  indexOf WordToFind   iii1    1    gt  0                positions  iii3    iii1-1              iii3   iii3   1              System out println  position     positions  iii3 - 1                        return iii2

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Finding a single index  As others have said  use text indexOf match  to find a single match   String text    0123456789hello0123456789   String match    hello   int position   text indexOf match      position   10   Finding multiple indexes  Because of  StephenC s comment about code maintainability and my own difficulty in understanding  polygenelubricants  answer  I wanted to find another way to get all the indexes of a match in a text string  The following code  which is modified from this answer  does so   String text    0123hello9012hello8901hello7890   String match    hello    int index   text indexOf match   int matchLength   match length    while  index  gt   0        indexOf returns -1 if no match found     System out println index       index   text indexOf match  index   matchLength

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text indexOf match     See the String javadoc

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If you re going to scan for  n  matches of the search string  I d recommend using regular expressions  They have a steep learning curve  but they ll save you hours when it comes to complex searches

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for multiple occurrence and the character found in string  yes or no  import java io BufferedReader  import java io InputStreamReader   public class SubStringtest        public static void main String   args throws Exception       BufferedReader br new BufferedReader new InputStreamReader System in         System out println  enter the string        String str br readLine        System out println  enter the character which you want        CharSequence ch br readLine           boolean bool str contains ch       System out println  the character found is    bool       int position str indexOf ch toString          while position gt  0           System out println  the index no of character is    position            position str indexOf ch toString   position 1

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You can get all matches in a file simply by assigning inside while-loop  cool     javac MatchTest java    java MatchTest  1 16 31 46   cat MatchTest java  import java util    import java io     public class MatchTest       public static void main String   args           String match    hello           String text    hello0123456789hello0123456789hello1234567890hello3423243423232           int i  0          while  i  text indexOf match i  1   gt 0              System out println i

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The family of methods that does this are    int indexOf String str    indexOf String str  int fromIndex   int lastIndexOf String str    lastIndexOf String str  int fromIndex        Returns the index within this string of the first  or last  occurrence of the specified substring  searching forward  or backward  starting at the specified index       String text    0123hello9012hello8901hello7890   String word    hello    System out println text indexOf word       prints  4  System out println text lastIndexOf word       prints  22      find all occurrences forward for  int i   -1   i   text indexOf word  i   1      -1  i          System out println i        prints  4    13    22      find all occurrences backward for  int i   text length     i   text lastIndexOf word  i - 1      -1  i          System out println i        prints  22    13    4

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I have some big code but working nicely         class strDemo              public static void main String args                    String s1 new String  The Ghost of The Arabean Sea               String s2 new String   The               String s6 new String   ehT               StringBuffer s3             StringBuffer s4 new StringBuffer s1              StringBuffer s5 new StringBuffer s2              char c1   new char 30              char c2   new char 5              char c3   new char 5              s1 getChars 0 28 c1 0              s2 getChars 0 3 c2 0              s6 getChars 0 3 c3 0   s3 s4 reverse                     int pf 0 pl 0             char c5   new char 30              s3 getChars 0 28 c5 0              for int i 0 i lt  s1 length  -s2 length    i                                int j 0                 if pf lt  1                                     while  c1 i j   c2 j   amp  amp  j lt  s2 length                                                       j                        System out println s2 length       j                       if j gt  s2 length                                                 System out println  first match of The   - gt   i                                                pf pf 1                                                                                          for int i 0 i lt  s3 length  -s6 length   1  i                          int j 0              if pl lt  1                             while  c5 i j   c3 j   amp  amp  j lt  s6 length                                    j                     System out println s6 length       j                    if j gt  s6 length                                                System out println  s3 length  -i-3                             pl pl 1

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String match    hello       String text    0123456789hello0123456789hello        int j   0      String indxOfmatch            for  int i   -1  i  lt  text length   1  i              j    text indexOf  hello   i           if  i gt  j  amp  amp  j  gt  -1                indxOfmatch    text indexOf  hello   i                           System out println indxOfmatch

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int match position text indexOf match

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This works using regex   String text    I love you so much   String wordToFind    love   Pattern word   Pattern compile wordToFind   Matcher match   word matcher text    while  match find           System out println  Found love at index    match start      -     match end  -1        Output       Found  love  at index 2 - 5   General Rule     Regex search left to right  and once the match characters has been used  it cannot be reused

[java] Java: method to get position of a match in a String?

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