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Asked: 2026-05-11T19:45:55+00:00

How can I write a RE which validates the URLs without the scheme: Pass:

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How can I write a RE which validates the URLs without the scheme:

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  1. Editorial Team
    ^[A-Za-z0-9][A-Za-z0-9.-]+(:\d+)?(/.*)?$
    • string must start with an ASCII letter or number
    • ASCII letters, numbers, dots and dashes follow (no slashes or colons allowed)
    • optional: a port is allowed (":8080")
    • optional: anything after a slash may follow (since you said “URL”)
    • then the end of the string

    Thoughts:

    • no line breaks allowed
    • no validity or sanity checking
    • no support for “internationalized domain names” (IDNs)
    • leave off the “optional:” parts if you like, but be sure to include the final “$“

    If your regex flavor supports it, you can shorten the above to:

    ^[A-Za-z\d][\w.-]+(:\d+)?(/.*)?$

    Be aware that \w may include Unicode characters in some regex flavors. Also, \w includes the underscore, which is invalid in host names. An explicit approach like the first one would be safer.

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