Regex for empty string or white space

Question

I am trying to detect if a user enter whitespace in a textbox    var regex      s        if     siren   val   match regex          echo     siren   val          error  1          siren   addClass  error            div-error   append  - Champ Siren Siret ne doit pas etre vide lt br  gt          if     siren   val   match regex   is supposed to match whitespace string  however  it doesn  t seems to work  what am I doing wrong    Thanks for your helps

User · Answer

If you are looking for empty string in addition to whitespace you meed to use   rather than    var regex      s

User · Answer

http   jsfiddle net DqGB8 1   This is my solution  var error 0  var test                  if test 0  match    s   g              output   html  MATCH          error  1     else            output   html  no match

User · Answer

Had similar problem  was looking for white spaces in a string  solution    To search for 1 space   var regex        s         example   user last name  To search for multiple spaces   var regex        s    g     example   user last name

User · Answer

If you re using jQuery  you have  trim     if      siren   val   trim                 it s empty

User · Answer

If one only cares about whitespace at the beginning and end of the string  but not in the middle   then another option is to use String trim          your string contents    trim          gt   your string contents

User · Answer

The    backslash  in the  match call is not properly escaped   It would be easier to use a regex literal though   Either will work   var regex       s     var regex      s       Also note that   will require at least one space   You may want to use

[javascript] Regex for empty string or white space

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