Why is this an issue?

JavaScript regular expressions provide Unicode character classes and Unicode property escapes for matching characters based on their Unicode values and Unicode properties respectively. When using Unicode property escapes like \p{Alpha} without the u flag, the regular expression will not match alphabetic characters but rather the '\p{Alpha}' string literal, which is likely a mistake.

This rules raises an issue when Unicode character classes and Unicode property escapes are used without the u flag.

Noncompliant code example

/\u{1234}/
/\p{Alpha}/

Compliant solution

/\u{1234}/u
/\p{Alpha}/u