Computing the ranges for "abc" in msg.content errors if "abc" contains invalid regex

[lbeurerkellner]

For instance, try this policy:

raise "Detected issue" if:
    # specify your conditions here
    # (you can learn more about Invariant policies at https://github.com/invariantlabs-ai/invariant)
    
    # specify policy conditions here to identify potential issues
    (msg: ToolOutput)
    "[File:" in msg.content

In case of a match of [File, when computing the ranges the analyzer breaks, since "[File" is not a valid regex.