Hi,

I often use Semgrep inline patterns (semgrep --lang=<lang> --pattern='<pattern>' ./) for finding certain simple patterns in codebases (similarly to https://github.com/weggli-rs/weggli).

It would be awesome if the CLI would support passing in metavariable regexes through a flag (or multiple flags). If this is already allowed, I haven't found it (and then I would suggest improving the semgrep --help).

I found there is a way to hack this around, at least for matching strings via regex via the deprecated feature: https://semgrep.dev/docs/writing-rules/pattern-syntax#string-matching -- so that we can do something like semgrep --lang=go --pattern='"=~/^http://[^1]/"' ./. However, it would be nice to have a way to pass metavariable regexes in the long term.