正则表达式删除文件名中的特殊字符（扩展名除外）

Question

I need to remove any special character from a filename except the extension.

Im using the javascript filename.replace(regex, '-');

Original filename: manuel fernandex – Index Prot.bla.otype 5 (pepito grillo).jpg

Target filename: manuel-fernandex-Index-Prot-bla-otype-5-pepito-grillo-.jpg

With this one, i get any special characters in block, just what i need, but need to skip the extension of the filename:

/[^\\w\\d]+/g Result: manuel-fernandex-Index-Prot-bla-otype-5-pepito-grillo-jpg

With this one, i remove any special character except the filename but also leaving all the dots in the filename:

[^\\d\\w\\_\\-\\.]+ Result: manuel-fernandex-Index-Prot.bla.otype-5-pepito-grillo.jpg

Im very close but i cant find the final solution.

Answer 1

You may remove any chars other than word and dot chars with [^\\w.] and any dot not followed with 1+ non-dot chars at the end of the string:

filename = filename.replace(/(?:\.(?![^.]+$)|[^\w.])+/g, "-");

See the regex demo

Details

• (?: - start of a non-capturing group:
  • \\.(?![^.]+$) - any dot not followed with 1+ non-dot chars at the end of the string
  • | - or
  • [^\\w.] - any char other than a word char and a dot char
• )+ - end of the group, repeat 1 or more times.

Another solution ( if extensions are always present ): split out the extension, run your simpler regex on the first chunk then join back:

 var filename = "manuel fernandex – Index Prot.bla.otype 5 (pepito grillo).jpg"; var ext = filename.substr(filename.lastIndexOf('.') + 1); var name = filename.substr(0, filename.lastIndexOf('.')); console.log(name.replace(/\\W+/g, "-") + "." + ext); 

Note your /[^\\w\\d]+/g and /\\W+/g are equal as \\w includes \\d .

Or, if extensions are optional, split with the last dot, replace as in the previous solution, and join back:

 var filename = "manuel fernandex – Index Prot.bla.otype 5 (pepito grillo).jpg"; var parts = filename.split(/\\.(?=[^.]*$)/); parts[0] = parts[0].replace(/\\W+/g, "-"); console.log(parts.join("."));