How to extract a substring using regex

Question

I have a string that has two single quotes in it  the   character  In between the single quotes is the data I want   How can I write a regex to extract  the data i want  from the following text   mydata    some string with  the data i want  inside

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Because you also ticked Scala  a solution without regex which easily deals with multiple quoted strings   val text    some string with  the data i want  inside  and even more data   text split      zipWithIndex filter    2   2    0  map    1   res  Array java lang String    Array the data i want  and even more data

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In Scala   val ticks               r  ticks findFirstIn mydata match       case Some ticks inside     gt  println inside      case     gt  println  nothing      for  ticks inside   lt - ticks findAllIn mydata  println inside     multiple matches  val Some ticks inside     ticks findFirstIn mydata    may throw exception  val ticks                   r     val ticks inside    mydata    safe  shorter  only gets the first set of ticks

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You don t need regex for this   Add apache commons lang to your project  http   commons apache org proper commons-lang    then use   String dataYouWant   StringUtils substringBetween mydata

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String dataIWant   mydata split      1    See Live Demo

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There s a simple one-liner for this   String target   myData replaceAll                          1      By making the matching group optional  this also caters for quotes not being found by returning a blank in that case   See live demo

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add apache commons dependency on your pom xml   lt dependency gt       lt groupId gt org apache commons lt  groupId gt       lt artifactId gt commons-io lt  artifactId gt       lt version gt 1 3 2 lt  version gt   lt  dependency gt    And below code works   StringUtils substringBetween String mydata  String      String

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Apache Commons Lang provides a host of helper utilities for the java lang API  most notably String manipulation methods   In your case  the start and end substrings are the same  so just call the following function    StringUtils substringBetween String str  String tag        Gets the String that is nested in between two instances of the same   String    If the start and the end substrings are different then use the following overloaded method     StringUtils substringBetween String str  String open  String close        Gets the String that is nested in between two Strings    If you want all instances of the matching substrings  then use    StringUtils substringsBetween String str  String open  String close        Searches a String for substrings delimited by a start and end tag    returning all matching substrings in an array    For the example in question to get all instances of the matching substring  String   results   StringUtils substringsBetween mydata

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you can use this  i use while loop to store all matches substring in the array  if you use  if  matcher find          System out println matcher group 1       you will get on matches substring  so you can use this to get all matches substring  Matcher m   Pattern compile   a-zA-Z0-9   -    a-zA-Z0-9-      a-zA-Z0-9-      matcher text         Matcher  mat   pattern matcher text       ArrayList lt String gt matchesEmail   new ArrayList lt  gt             while  m find                 String s   m group                if  matchesEmail contains s                   matchesEmail add s                  Log d TAG   emails    matchesEmail

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String dataIWant   mydata replaceFirst                  1

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as in javascript   mydata match              1    the actual regexp is               if you use the non greedy modifier  as per another post  it s like this   mydata match            1    it is cleaner

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Some how the group 1  didnt work for me  I used group 0  to find the url version   Pattern urlVersionPattern   Pattern compile     v 0-9  a-z  0 1        Matcher m   urlVersionPattern matcher url   if  m find           return StringUtils substringBetween m group 0                return  v0

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Assuming you want the part between single quotes  use this regular expression with a Matcher               Example   String mydata    some string with  the data i want  inside   Pattern pattern   Pattern compile             Matcher matcher   pattern matcher mydata   if  matcher find          System out println matcher group 1        Result    the data i want

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Since Java 9 As of this version  you can use a new method Matcher  results with no args that is able to comfortably return Stream lt MatchResult gt  where MatchResult represents the result of a match operation and offers to read matched groups and more  this class is known since Java 1 5   String string    quot Some string with  the data I want  inside and  another data I want   quot    Pattern pattern   Pattern compile  quot         quot    pattern matcher string          results                            Stream lt MatchResult gt          map mr - gt  mr group 1               Stream lt String gt  - the 1st group of each result         forEach System out  println        print them out  or process in other way      The code snippet above results in   the data I want another data I want   The biggest advantage is in the ease of usage when one or more results is available compared to the procedural if  matcher find    and while  matcher find    checks and processing

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import java util regex Matcher  import java util regex Pattern   public class Test       public static void main String   args            Pattern pattern   Pattern compile                           String mydata    some string with  the data i want  inside            Matcher matcher   pattern matcher mydata           if matcher matches                  System out println matcher group 1

[java] How to extract a substring using regex

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