I'm currently hardcoding testing if a file extension is in a string.
My hardcode way with one extension is
var extension = /(\.txt)$/i;
var testFile = "myTest.txt";
alert(extension.test(testFile));
I plan to make this database driven and sent the file extensions in a comma separated list.
How can I parse a comma separated list and test if my String extension is in that list?
var testFile = "mytest.txt"
var validExtensions = "xlsx,txt,csv";
You should use the OR operator, pipeline.
var extension = /(\.txt|\.xls|\.csv)$/i;
Using input string:
var extensionsString = 'csv|txt|xlsx';
var pattern = new RegExp('(\.)(' + extensionsString + ')$', 'ig');
console.log('somepath/somefile.txt'.match(pattern));
You don't need regular expressions to assert the position of the match at the end of the string.
Instead, you can use ECMAScript6 String.prototype.endsWith, which can be polyfilled.
validExtensions.split(',').some(ext => testFile.endsWith('.' + ext));
Split an array and use each item in your regular expression:
validExtensions.split(',').some(function(ext) {
return new RegExp('(\.' + ext + ')$').test(fileName);
});
