Detect if string contains any spaces

Question

How do I detect if a string has any whitespace characters    The below only detects actual space characters  I need to check for any kind of whitespace   if str indexOf       gt   0       console log  contains spaces

User · Accepted Answer

What you have will find a space anywhere in the string  not just between words   If you want to find any kind of whitespace  you can use this  which uses a regular expression   if    s  test str            It has any kind of whitespace      s means  any whitespace character   spaces  tabs  vertical tabs  formfeeds  line breaks  etc    and will find that character anywhere in the string   According to MDN   s is equivalent to     f n r t v  u00a0 u1680  u180e u2000  u2001 u2002  u2003 u2004  u2005 u2006  u2007 u2008  u2009 u200a  u2028 u2029   u202f u205f  u3000      For some reason  I originally read your question as  How do I see if a string contains only spaces   and so I answered with the below  But as  CrazyTrain points out  that s not what the question says  I ll leave it  though  just in case     If you mean literally spaces  a regex can do it   if         test str            It has only spaces  or is empty     That says  Match the beginning of the string     followed by zero or more space characters followed by the end of the string      Change the   to a   if you don t want to match an empty string   If you mean whitespace as a general concept   if     s    test str            It has only whitespace     That uses  s  whitespace  rather than the space  but is otherwise the same   And again  change   to   if you don t want to match an empty string

User · Answer

A secondary option would be to check otherwise  with not space   S   using an expression similar to     S     Test   x000D   x000D  function has any spaces regex  str    x000D   if  regex test str     str           x000D    return false  x000D     x000D   return true  x000D    x000D   x000D  const expression      S   g  x000D  const string    foo  baz bar   x000D   x000D  console log has any spaces expression  string    x000D   x000D   x000D    Here  we can for instance push strings without spaces into an array    x000D   x000D  const regex      S   gm  x000D  const str     x000D  foo x000D  foo baz x000D  bar x000D  foo baz bar x000D  abc x000D  abc abc x000D  abc abc abc x000D     x000D  let m  arr       x000D   x000D  while   m   regex exec str       null    x000D      This is necessary to avoid infinite loops with zero-width matches x000D   if  m index     regex lastIndex    x000D    regex lastIndex    x000D     x000D   x000D      Here  we push those strings without spaces in an array x000D   m forEach  match  groupIndex    gt    x000D    arr push match   x000D       x000D    x000D  console log arr   x000D   x000D   x000D      If you wish to simplify modify explore the expression  it s been explained on the top right panel of regex101 com  If you d like  you can also watch in this link  how it would match against some sample inputs     RegEx Circuit  jex im visualizes regular expressions

User · Answer

var string     hello world   var arr   string split         converted the string to an array and then checked   if arr i               console log i       I know regex can do the trick too

User · Answer

function hasSpaces str      if  str indexOf          -1        return true     else       return false

User · Answer

var inValid   new RegExp     A-z0-9  1       var value    test string   var k   inValid test value   alert k

[javascript] Detect if string contains any spaces

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