a788bf87a0
These were originally meant to give you the term that is textually matched right before/right after the receiver. When I introduced support for lookbehinds, I changed the behaviour to give you the term that is _operationally_ matched before/after the receiver (remember that lookbehinds are implemented by reverse-matching). However, I think that's rarely ever what you want, and is wrong for the only two uses of these predicates, where it's the textual matching order that we are after, not the operational order. Consequently, I've changed the semantics back and updated the comments to hopefully clarify the intention.
CodeQL
This open source repository contains the standard CodeQL libraries and queries that power LGTM, and the other products that Semmle makes available to its customers worldwide.
How do I learn CodeQL and run queries?
There is extensive documentation on getting started with writing CodeQL. You can use the interactive query console on LGTM.com or the CodeQL for Visual Studio Code extension to try out your queries on any open source project that's currently being analyzed.
Contributing
We welcome contributions to our standard library and standard checks. Do you have an idea for a new check, or how to improve an existing query? Then please go ahead and open a pull request! Before you do, though, please take the time to read our contributing guidelines. You can also consult our style guides to learn how to format your code for consistency and clarity, how to write query metadata, and how to write query help documentation for your query.
License
The code in this repository is licensed under Apache License 2.0 by Semmle.