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Valid email address should only start with alphanumeric (#28174)

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This fixes issue #27847 where regular expression allowed email address
to start with special symbols. Valid email addresses should start with
alphanumeric character, and as such will be rendered as email.

Added test cases from the bug report to validate, such input will not be
rendered anymore as email address.

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
This commit is contained in:
Dejan Kitic
2025-04-20 12:18:14 +01:00
committed by GitHub
parent 6d3c6741ec
commit af6be75adb
3 changed files with 43 additions and 10 deletions
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3
modules/markup/html.go
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@ -71,7 +71,8 @@ var globalVars = sync.OnceValue(func() *globalVarsType {
// it is still accepted by the CommonMark specification, as well as the HTML5 spec:
// http://spec.commonmark.org/0.28/#email-address
// https://html.spec.whatwg.org/multipage/input.html#e-mail-state-(type%3Demail)
v.emailRegex = regexp.MustCompile("(?:\\s|^|\\(|\\[)([a-zA-Z0-9.!#$%&'*+\\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9]{2,}(?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)+)(?:\\s|$|\\)|\\]|;|,|\\?|!|\\.(\\s|$))")
// At the moment, we use stricter rule for rendering purpose: only allow the "name" part starting after the word boundary
v.emailRegex = regexp.MustCompile(`\b([-\w.!#$%&'*+/=?^{|}~]*@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9]{2,}(?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)+)\b`)
// emojiShortCodeRegex find emoji by alias like :smile:
v.emojiShortCodeRegex = regexp.MustCompile(`:[-+\w]+:`)