consul/website/content/partials/envoy_ext_rule_matcher.mdx

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<!-- Potentially adapt to all conf refs that use this matching scheme-->
| Rule | Description | Data type | Default |
| --- | --- | --- | --- |
| `Contains` | Specifies a string that the input string must contain. | String | N/A |
| `Exact` | Specifies a string that the input string must match exactly. | String | N/A |
| `IgnoreCase` | Directs Envoy to ignore capitalization. If set to `true`, the other matching rules in the configuration are not case sensitive. This rule does not affect `SafeRegex`. | Boolean | `false` |
| `Prefix` | Specifies a string that the input string must begin with. | String | N/A |
| `SafeRegex` | Specifies a regular expression for matching the input string programmatically. Envoy supports [Google's RE2 regex engine](https://github.com/google/re2/wiki/Syntax). | String | N/A |
| `Suffix` | Specifies a string that the input string must end with. | String | N/A |