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.

Answer 1

而不是检查整个字符串以查看是否只有空格,只需检查是否至少有一个非空格字符:

if (/\S/.test(myString)) {
    // string is not empty and not just whitespace
}

Answer 2

if (/^\s+$/.test(myString))
{
      //string contains only whitespace
}

这将检查一个或多个空格字符,如果它也匹配一个空字符串,则替换+为*.

Answer 3

如果您的浏览器支持该trim()功能,最简单的答案

if (myString && !myString.trim()) {
    //First condition to check if string is not empty
    //Second condition checks if string contains just whitespace
}

Answer 4

好吧,如果你使用的是jQuery,那就更简单了.

if ($.trim(val).length === 0){
   // string is invalid
} 

Answer 5

只需检查此正则表达式的字符串:

if(mystring.match(/^\s+$/) === null) {
    alert("String is good");
} else {
    alert("String contains only whitespace");
}