compiler: interpolation ends early when a regular expression literal contains }} #71915

Bug

Hi Angular team! Angular treats }} inside a regular expression literal as the end of an interpolation.

Minimal reproduction

{{ /[}}]/u.test('}') }}

Expected true. Actual Unexpected closing block. The same expression fails in a title interpolation with Unterminated regular expression but parses successfully in a property binding. The equivalent pattern /[}]/u also parses in interpolation. AOT compilation with ngc reports NG5002 for {{ /}}/.test('}}') }}.

Cause and possible fix

The scanners appear to treat }} inside the regex as a closing delimiter. A possible fix is to skip regex literal contents while preserving division expressions such as {{ 6 / 2 }}. HTML lexer · Expression parser

Environment

Angular compiler 22.2.5, Node.js 24.22.2, macOS arm64. Regression status unknown.