For BiDi attacks, assuming a shell that understands $''-strings (such as bash or zsh) and that the locale encoding matches the source encoding, this should work

For BiDi attacks, assuming a shell that understands $''-strings (such as bash or zsh) and that the locale encoding matches the source encoding, this should work: grep -r $'[\u061C\u200E\u200F\u202A\u202B\u202C\u202D\u202E\u2066\u2067\u2068\u2069]' /path/to/source