问题
Looking for a regex/replace function to take a user inputted string say, "John Smith's Cool Page" and return a filename/url safe string like "john_smith_s_cool_page.html", or something to that extent.
回答1:
Well, here's one that replaces anything that's not a letter or a number, and makes it all lower case, like your example.
var s = "John Smith's Cool Page";
var filename = s.replace(/[^a-z0-9]/gi, '_').toLowerCase();
Explanation:
The regular expression is /[^a-z0-9]/gi. Well, actually the gi at the end is just a set of options that are used when the expression is used.
imeans "ignore upper/lower case differences"gmeans "global", which really means that every match should be replaced, not just the first one.
So what we're looking as is really just [^a-z0-9]. Let's read it step-by-step:
- The
[and]define a "character class", which is a list of single-characters. If you'd write[one], then that would match either 'o' or 'n' or 'e'. - However, there's a
^at the start of the list of characters. That means it should match only characters not in the list. - Finally, the list of characters is
a-z0-9. Read this as "a through z and 0 through 9". It's is a short way of writingabcdefghijklmnopqrstuvwxyz0123456789.
So basically, what the regular expression says is: "Find every letter that is not between 'a' and 'z' or between '0' and '9'".
回答2:
I know the original poster asked for a simple Regular Expression, however, there is more involved in sanitizing filenames, including filename length, reserved filenames, and, of course reserved characters.
Take a look at the code in node-sanitize-filename for a more robust solution.
回答3:
I think your requirement is to replaces white spaces and aphostophy `s with _ and append the .html at the end try to find such regex.
refer
http://www.regular-expressions.info/javascriptexample.html
回答4:
For more flexible and robust handling of unicode characters etc, you could use the slugify in conjunction with some regex to remove unsafe URL characters
const urlSafeFilename = slugify(filename, { remove: /"<>#%\{\}\|\\\^~\[\]`;\?:@=&/g });
This produces nice kebab-case filenemas in your url and allows for more characters outside the a-z0-9 range.
来源：https://stackoverflow.com/questions/8485027/javascript-url-safe-filename-safe-string