CODEWITHSUNDEEP
javascriptregex
largoWinch
largoWinch

Reputation: 417

Regex for file, specially pdf - Javascript

I am new at creating regulars expressions, but I am not sure how to do it to validate the creation of the name of a pdf file (created by myself). I don't want any special character or spaces, etc. I want to do it with Javascript, I don't know if that is important. Any help would be appreciated. Thank you.

Upvotes: 1

Views: 2763

Answers (1)

LIvanov
LIvanov

Reputation: 1336

Assuming some common practices about file names, I would suggest one restricts a filename to alphanumeric-characters, slash, underscore and some brackets, then generally I would use the following piece of code

var patt =/^[a-z0-9_()\-\[\]]+\.pdf$/i;
var fileName = "my_test.pdf";
if (fileName.search(patt) < 0) {
  // filename doesn't match the Regex
} else {
  // filename matches the Regex
}

Generally the JS regex has two parts in this case, /regex/i where regex is the regex (doh), and i is a switch meaning "ignore-case". The regex itself says that anything from a-z, 0-9, underscore, parenthesis, (escaped) slash, (escaped) opening and closing square brackets, should be allowed at least one time (the + sign), and this should be followed by a (escaped) dot and the "pdf" string.

The ^ sign stands for "beginning of string" and the $ stands for "end of string". So this will help you avoid situation like this:

%`some_valid_name.pdf``*\

If you do not put the ^ and $ signs, this will be a valid match, according to regex.

Upvotes: 5

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