javascript regex to check if a string is not all spaces

Question

What is the regex to check if a string is not all spaces (spaces = spacebar, tab etc.)? It's ok if there is at least one or more non space characters in string.

Example:

str = ''       // not allowed
str = '      ' // not allowed
str = '     d' // allowed
str = 'a    '  // allowed
str = '  d  '  // allowed
str = '  @s '  // allowed

I was trying this, but this seems to return true for everything...

str = '   a';
regex = /[\s]+/g;;
console.log(regex.test(str));

P.S I cannot use trim in here.

CertainPerformance · Accepted Answer · 2020-10-30 04:12:34Z

4

All you need is a test for \S, a non-space character:

const isAllowed = str => /\S/.test(str);

console.log(
  isAllowed(''),
  isAllowed('    '),
  isAllowed('    d'),
  isAllowed('a    '),
);

answered Oct 30, 2020 at 4:12

CertainPerformance

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Comments

Tim Biegeleisen · Accepted Answer · 2020-10-30 04:23:04Z

0

We could also use trim() here. A string containing only whitespace would have a trimmed length of zero:

var input = "   \t\t\t  \n";
if (input.trim().length == 0) {
    console.log("input has only whitespace");
}

input = "  Hello World!  \t\n ";
if (input.trim().length == 0) {
    console.log("input has only whitespace");
}

answered Oct 30, 2020 at 4:23

Tim Biegeleisen

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