# E0097

Warning name: `regex_runtime_fallback`

The regex match exceeds a compilation resource limit and uses the runtime
regex engine instead. The match is still accepted; this warning is not a
runtime matching error.

This warning is disabled by default. Enable `regex_runtime_fallback` in the
package warning configuration to receive it.

## Suggestion

If the fallback is acceptable, no correctness fix is required. If performance
matters, measure the affected operation and consider simplifying the patterns
or splitting the match into smaller operations.

If runtime fallback is unavailable, exceeding the compilation limit produces
[E4233](./E4233.md) instead.