What is the best way to extract the first word from a string in Java

Question

Trying to write a short method so that I can parse a string and extract the first word  I have been looking for the best way to do this   I assume I would use str split       however I would like to grab just the first first word from a string  and save that in one variable  and and put the rest of the tokens in another variable   Is there a concise way of doing this

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like this   final String str    This is a long sentence   final String   arr   str split      2   System out println Arrays toString arr      arr 0  is the first word  arr 1  is the rest

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To simplify the above    text substring 0  text indexOf           Here is a ready function   private String getFirstWord String text       int index   text indexOf          if  index  gt  -1       Check if there is more than one word       return text substring 0  index  trim       Extract first word       else        return text     Text is the first word itself

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import org apache commons lang3 StringUtils       StringUtils substringBefore  Grigory Kislin

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You can use String split with a limit of 2        String s    Hello World  I m the rest        String   result   s split      2       String first   result 0       String rest   result 1       System out println  First      first       System out println  Rest      rest           prints   gt         First  Hello        Rest  World  I m the rest     API docs for  split

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String anotherPalindrome    Niagara  O roar again     String roar   anotherPalindrome substring 11  15      You can also do like these

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for those who are searching for kotlin var delimiter    quot   quot    var mFullname    quot Mahendra Rajdhami quot    var greetingName   mFullname substringBefore delimiter

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The second parameter of the split method is optional  and if specified will split the target string only N times     For example   String mystring    the quick brown fox   String arr     mystring split      2    String firstWord   arr 0       the String theRest   arr 1         quick brown fox   Alternatively you could use the substring method of String

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You should be doing this  String input    hello world  this is a line of text    int i   input indexOf       String word   input substring 0  i   String rest   input substring i     The above is the fastest way of doing this task

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I know this question has been answered already  but I have another solution  For those still searching for answers  which can fit on one line  It uses the split functionality but only gives you the 1st entity   String test    123 456   String value   test split      0   System out println value     The output will show   123

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None of these answers appears to define what the OP might mean by a  word   As others have already said  a  word boundary  may be a comma  and certainly can t be counted on to be a space  or even  white space   i e  also tabs  newlines  etc    At the simplest  I d say the word has to consist of any Unicode letters  and any digits  Even this may not be right  a String may not qualify as a word if it contains numbers  or starts with a number   Furthermore  what about hyphens  or apostrophes  of which there are presumably several variants in the whole of Unicode  All sorts of discussions of this kind and many others will apply not just to English but to all other languages  including non-human language  scientific notation  etc   It s a big topic   But a start might be this  NB written in Groovy    String givenString    one two9 thr0ee four     String givenString    onn      ne  two9   thr0e    four      String givenString    mouse     String givenString     amp  amp        String   substrings   givenString split       p L    d       println  substrings   substrings    println  first word    substrings 0       This works OK for the first  second and third givenStrings   For   amp  amp       it says that the first  word  is a zero-length string  and the second is        Actually a leading zero-length token is String split s way of saying  your given String starts not with a token but a delimiter    NB in regex  p L  means  any Unicode letter    The parameter of String split is of course what defines the  delimiter pattern     i e  a clump of characters which separates tokens     NB2 Performance issues are irrelevant for a discussion like this  and almost certainly for all contexts   NB3 My first port of call was Apache Commons  StringUtils package  They are likely to have the most effective and best engineered solutions for this sort of thing   But nothing jumped out    https   commons apache org proper commons-lang apidocs org apache commons lang3 StringUtils html     although something of use may be lurking there

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You could also use http   download oracle com javase 6 docs api java util StringTokenizer html

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You could use a Scanner  http   download oracle com javase 1 5 0 docs api java util Scanner html     The scanner can also use delimiters   other than whitespace  This example   reads several items in from a string        String input    1 fish 2 fish red fish blue fish        Scanner s   new Scanner input  useDelimiter    s fish  s          System out println s nextInt          System out println s nextInt          System out println s next          System out println s next          s close           prints the following output        1      2      red      blue

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The simple one I used to do is  str contains        str split      0    str   Where str is your string or text bla bla     So  if   str is having empty value it returns as it is  str is having one word  it returns as it is  str is multiple words  it extract the first word and return    Hope this is helpful

[java] What is the best way to extract the first word from a string in Java?

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