I'm having trouble getting my code below to work properly. I'm not sure if the problem lies in the match function syntax or the regex itself. Any assistance would be greatly appreciated.
$scope.fileSelected = function (file) {
var valid = "/^[0-9a-zA-Z]+$/";
if (file.name.match(!valid)) {
alert("The file name contains characters that are not allowed (#, &, %, etc.)");
}
}
Solution:
Your issue lies in the placement of the exclamation mark. Consider modifying your code like this:
if (!file.name.match(valid)){
Insight:
The exclamation mark negates the value, providing the opposite boolean outcome. Essentially, it converts "truthy" to false, and "falsy" to true.
Understanding truthy/falsy is fundamental in various programming languages. Check out more details here: https://developer.mozilla.org/en-US/docs/Glossary/Truthy
Your variable valid represents a RegEx object, which always evaluates as truthy. As a result, !valid will consistently return false.
The original code interpretation implies:
If the file's name matches "false"
To convey the intended logic, adjust the expression to signify:
If it is not true that "the file's name matches this RegEx"
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