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# urlencode(), url-encode()

```
string urlencode(string argument)
string url-encode(string argument)
```

`urlencode` expects exactly one `string` as a parameter. Returns a string in which all non-alphanumeric characters except -\_.\~ have been replaced with a percent (%) sign followed by two hex digits. Cf. [RFC 3986](http://www.faqs.org/rfcs/rfc3986.html) `url-encode` is an alias for `urlencode`.