Security fix for ReDoS

[ready-research]

Fixed Regular Expression Denial of Service vulnerability in URL validation.

Reported in huntr https://www.huntr.dev/bounties/395edb43-4ef5-4582-b22d-3abbecfbcc14/ Please Confirm the fix once it's merged. Thanks.

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[JohnNiang]

/cc @halo-dev/sig-halo