Split string on the first white space occurrence

Question

I didn t get an optimized regex that split me a String basing into the first white space occurrence   var str  72 tocirah sneab     I need to get          72        tocirah sneab

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I have used  split  quot   quot   0  to get all the characters before space  productName split  quot   quot   0

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Just split the string into an array and glue the parts you need together  This approach is very flexible  it works in many situations and it is easy to reason about  Plus you only need one function call   arr   str split                        72    tocirah    sneab   strA   arr 0                          72  strB   arr 1          arr 2           tocirah sneab    Alternatively  if you want to cherry-pick what you need directly from the string you could do something like this   strA   str split      0                          72   strB   str slice strA length   1                 tocirah sneab    Or like this   strA   str split      0                          72   strB   str split      splice 1  join             tocirah sneab    However I suggest the first example   Working demo  jsbin

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In ES6 you can also  let  first     second    str split      second   second join

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Another simple way  str    text1 text2 text3   strFirstWord   str split      0   strOtherWords   str replace strFirstWord              Result  strFirstWord    text1   strOtherWords    text2 text3

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Javascript doesn t support lookbehinds  so split is not possible  match works   str match     S   s       slice 1    Another trick   str replace   s      x01   split   x01     how about    str replace   s          str replace   S  s          and why not  reverse   function  s    return s split     reverse   join       reverse str  split   s    S      reverse   map reverse    or maybe  re      S  s    g     concat call re exec str   re exec str     2019 update  as of ES2018  lookbehinds are supported    x000D   x000D  str    72 tocirah sneab  x000D  s   str split     lt    S   s   x000D  console log s  x000D   x000D   x000D

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I needed a slightly different result   I wanted the first word  and what ever came after it - even if it was blank   str substr 0  text indexOf         -1   text length   text indexOf        str substr text indexOf         -1   text length   text indexOf        1     so if the input is oneword you get oneword and      If the input is one word and some more you get one and word and some more

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Whenever I need to get a class from a list of classes or a part of a class name or id  I always use split   then either get it specifically with the array index or  most often in my case  pop   to get the last element or shift   to get the first   This example gets the div s classes  gallery 148 ui-sortable  and returns the gallery id 148   var galleryClass     this  parent   prop  class         gallery 148 ui-sortable var galleryID   galleryClass split      shift         gallery 148 galleryID   galleryID split      pop         148   or galleryID   galleryID substring 8        148 also  but less versatile    I m sure it could be compacted into less lines but I left it expanded for readability

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The following function will always split the sentence into 2 elements  The first element will contain only the first word and the second element will contain all the other words  or it will be a empty string    var arr1   split on first word  72 tocirah sneab             Result    72    tocirah sneab   var arr2   split on first word    72  tocirah sneab          Result    72    tocirah sneab   var arr3   split on first word  72                           Result    72       var arr4   split on first word                               Result            function split on first word str        str   str trim        Clean string by removing beginning and ending spaces       var arr           var pos   str indexOf           Find position of first space      if   pos     -1                No space found         arr push str                     First word  or empty          arr push                         Empty  no next words        else              Split on first space         arr push str substr 0 pos               First word         arr push str substr pos 1  trim         Next words            return arr

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georg s solution is nice  but breaks if the string doesn t contain any whitespace  If your strings have a chance of not containing whitespace  it s safer to use  split and capturing groups like so   str 1   str split   s       0      everything before the first space str 2   str split   s       1      everything after the first space

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I m not sure why all other answers are so complicated  when you can do it all in one line  handling the lack of space as well  As an example  let s get the first and  quot rest quot  components of a name   x000D   x000D  const  first  rest     John Von Doe  split   s         console log   first  rest         As array const components    Surma  split   s         console log components   x000D   x000D   x000D

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If you only care about the space character  and not tabs or other whitespace characters  and only care about everything before the first space and everything after the first space  you can do it without a regular expression like this   str substr 0 str indexOf            72  str substr str indexOf      1       tocirah sneab    Note that if there is no space at all  then the first line will return an empty string and the second line will return the entire string   Be sure that is the behavior that you want in that situation  or that that situation will not arise

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var arr                     new storage str   str split             split by spaces arr push str shift          add the number arr push str join           and the rest of the string    arr is now    72   tocirah sneab      but i still think there is a faster way though

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You can also use  replace to only replace the first occurrence    str   str replace       lt br   gt       Leaving out the  g   DEMO

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Most of the answers above search by space  not whitespace   georg s answer is good  I have a slightly different version  s trim   split   s       splice 0 2   I m not sure how to tell which is most efficient as the regexp in mine is a lot simpler  but it has the extra splace    georg s for reference is s split     lt    S   s    The question doesn t specify how to handle no whitespace or all whitespace  leading or trailing whitespace or an empty string  and our results differ subtly in those cases  I m writing this for a parser that needs to consume the next word  so I prefer my definition  though  georg s may be better for other use cases  input         mine               georg  aaa bbb        aaa   bbb         aaa   bbb    aaa bbb ccc    aaa   bbb ccc     aaa   bbb ccc    aaa             aaa               aaa                                                                                       aaa           aaa                aaa

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Late to the game  I know but there seems to be a very simple way to do this    x000D   x000D  const str    72 tocirah sneab   x000D  const arr   str split           x000D  console log arr   x000D   x000D   x000D    This will leave arr 0  with  72  and arr 1  with  tocirah sneab   Note that arr 2  will be empty  but you can just ignore it   For reference   https   developer mozilla org en-US docs Web JavaScript Reference Global Objects String split Capturing parentheses

[javascript] Split string on the first white space occurrence

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