AFAIK you would need to set that up yourself. Github has its own search syntax with qualifiers you can add, but not full regex. The api uses the same syntax as the in-browser search.

Currently, there is no regex support for the REST API when searching for code. Instead, one must use the WebUI¹ for regex searches.

I can't see any documentation around this.

The docs² note that characters for regex search are simply ignored in the API.

There has been no official announcement or blog post from GitHub about adding regex support to the code search REST API. The only indication thus far is a comment³ from a GitHub staff member about a year ago, suggesting it will be implemented but it's not ready yet.

Footnotes

1. Understanding GitHub Code Search syntax - Using regular expressions - GitHub Docs ↩

2. Searching code (legacy) - GitHub Docs ↩

3. 🚢 New code search and code view feedback · community · Discussion #54546 · GitHub ↩

@kaushalgupta94 unfortunately at this time, the REST API does not support regular expressions like the web UI. It's on our roadmap to fix, but has been delayed due to higher priority items.

There's a dedicated discussion for it: https://github.com/orgs/community/discussions/9991