Regex for not empty and not whitespace

Question

I am trying to create a regex that will return false if the String pattern contains whitespace or is empty  So far I have this     s     I think that will make sure the string does not contain whitespace but I am unsure of how to also check to make sure it is not empty  Any help would be appreciated

User · Answer

I ended up using something similar to the accepted answer, with minor modifications

(^$)|(\s+$)

Explanation by the Expresso

Select from 2 alternatives (^$)
    [1] A numbered captured group ^$
        Beginning of line ^
        End of line $
    [2] A numbered captured group (\s+$)
        Whitespace, one or more repetitions \s+
        End of line $

User · Answer

s     matches empty strings and strings containing whitespaces only

User · Answer

In my understanding you want to match a non-blank and non-empty string  so the top answer is doing the opposite  I suggest       s   S    s     - this matches any string containing at least one non-whitespace character  the  S in the middle   It can be preceded and followed by anything  any char or whitespace sequence  including new lines  -     s     You can try it with explanation on https   regex101 com

User · Answer

s   if this matched  there s whitespace or its empty

User · Answer

A little late  but here s a regex I found that returns 0 matches for empty or white spaces         s         You can test this out at regex101

User · Answer

s   This matches when empty or white spaces             s    This matches when its not empty or white spaces

User · Answer

Most regular expression engines support  counter part  escape sequences  That is  for  s  white-space  there s its counter part  S  non-white-space    Using this  you can check  if there is at least one non-white-space character with   S     PCRE for PHP has several of these escape sequences

[regex] Regex for not empty and not whitespace

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