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Asked: 2026-05-11T11:04:52+00:00

I am making a website with articles, and I need the articles to have

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I am making a website with articles, and I need the articles to have "friendly" URLs, based on the title.

For example, if the title of my article is "Article Test", I would like the URL to be http://www.example.com/articles/article_test.

However, article titles (as any string) can contain multiple special characters that would not be possible to put literally in my URL. For instance, I know that ? or # need to be replaced, but I don’t know all the others.

What characters are permissible in URLs? What is safe to keep?

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1 Answer

  1. To quote section 2.3 of RFC 3986:

    Characters that are allowed in a URI, but do not have a reserved purpose, are called unreserved. These include uppercase and lowercase letters, decimal digits, hyphen, period, underscore, and tilde.

      ALPHA  DIGIT  "-" / "." / "_" / "~"

    Note that RFC 3986 lists fewer reserved punctuation marks than the older RFC 2396.

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