<p>How do I check if a field (textbox) is empty or filled only with white spaces (spaces/enters/tabs etc.), using javascript RegExp?</p>

```
```
if (myField.value.match(/\S/)) {
  // field is not empty
}
// or
if (/\S/.test(myField.value)) {
  // field is not empty
}
```
```
Explanation, since other people seem to have some
crazy
different ideas:
```
\s
```
will match a space, tab or new line.
```
\S
```
will match anything but a space, tab or new line.
If your string has a single character which is not a space, tab or new line, then it's not empty.
Therefore you just need to search for one character:
```
\S
```