Which search engines can do “${@}” (or other searches with symbols), but are not limited to raw source code (such as GitHub is)?

Have used all possible combos of quotes/escape codes on Google, StartPage and DuckDuckGo without success.

Those search engines have regressed so much that now it is not possible to search for exact matches of alphanumerics (such as “2 4 6 4 2”), yet alone code.

Searches for search engines which can do this just have useless answers such as “But if all symbols are always interpreted as literals, how will search engines process commands?” (or other such comments which ignore the existence of escape sequences, which for decades, the most simple scripted languages and parsers have used).