How can I check if string contains characters whitespace not just whitespace

Question

What is the best way to check if a string contains only whitespace   The string is allowed to contain characters combined with whitespace  but not just whitespace

User · Answer

if     s    test myString             string contains only whitespace     this checks for 1 or more whitespace characters  if you it to also match an empty string then replace   with

User · Answer

Well  if you are using jQuery  it s simpler   if    trim val  length     0         string is invalid

User · Answer

if   myString replace    s   s   g        alert  string is only whitespace

User · Answer

Instead of checking the entire string to see if there s only whitespace  just check to see if there s at least one character of non whitespace   if    S  test myString            string is not empty and not just whitespace

User · Answer

The regular expression I ended up using for when I want to allow spaces in the middle of my string  but not at the beginning or end was this     S    s  S       or     S    s  S        So  I know this is an old question  but you could do something like   if     s    test myString           string contains characters and white spaces     or you can do what nickf said and use   if    S  test myString            string is not empty and not just whitespace

User · Answer

This can be fast solution  return input  lt    u0020    1

User · Answer

Just check the string against this regex   if mystring match    s         null        alert  String is good      else       alert  String contains only whitespace

User · Answer

Simplest answer if your browser supports the trim   function  if  myString  amp  amp   myString trim            First condition to check if string is not empty       Second condition checks if string contains just whitespace

User · Answer

I ve used the following method to detect if a string contains only whitespace  It also matches empty strings   if     s    test myStr          the string contains only whitespace

[javascript] How can I check if string contains characters & whitespace, not just whitespace?

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