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added hint why regular expressions might not be accepted

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Kubernetes validates all regular expressions using RE2 which does not support the full syntax of PCRE which uses NGINX.

see: #4989
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Herr-Sepp 2020-01-30 19:22:41 +01:00 committed by GitHub
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docs/user-guide/ingress-path-matching.md
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@ -8,6 +8,10 @@
The ingress controller supports **case insensitive** regular expressions in the `spec.rules.http.paths.path` field.
This can be enabled by setting the `nginx.ingress.kubernetes.io/use-regex` annotation to `true` (the default is false).
!!! hint
Kubernetes only accept expressions that comply with the RE2 engine syntax. It is possible that valid expressions accepted by NGINX cannot be used with ingress-nginx, because the PCRE library (used in NGINX) supports a wider syntax than RE2.
See the [RE2 Syntax](https://github.com/google/re2/wiki/Syntax) documentation for differences.
See the [description](./nginx-configuration/annotations.md#use-regex) of the `use-regex` annotation for more details.
```yaml