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Improve regexp matcher documentation

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Martin Rauscher 2022-01-10 14:32:04 +01:00 • committed by GitHub
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docs/content/routing/routers/index.md
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@ -233,11 +233,11 @@ The table below lists all the available matchers:
| ```Headers(`key`, `value`)``` | Check if there is a key `key`defined in the headers, with the value `value` |
| ```HeadersRegexp(`key`, `regexp`)``` | Check if there is a key `key`defined in the headers, with a value that matches the regular expression `regexp` |
| ```Host(`example.com`, ...)``` | Check if the request domain (host header value) targets one of the given `domains`. |
| ```HostHeader(`example.com`, ...)``` | Check if the request domain (host header value) targets one of the given `domains`. |
| ```HostRegexp(`example.com`, `{subdomain:[a-z]+}.example.com`, ...)``` | Check if the request domain matches the given `regexp`. |
| ```HostHeader(`example.com`, ...)``` | Same as `Host`, only exists for historical reasons. |
| ```HostRegexp(`example.com`, `{subdomain:[a-z]+}.example.com`, ...)``` | Match the request domain. See "Regexp Syntax" below. |
| ```Method(`GET`, ...)``` | Check if the request method is one of the given `methods` (`GET`, `POST`, `PUT`, `DELETE`, `PATCH`, `HEAD`) |
| ```Path(`/path`, `/articles/{cat:[a-z]+}/{id:[0-9]+}`, ...)``` | Match exact request path. It accepts a sequence of literal and regular expression paths. |
| ```PathPrefix(`/products/`, `/articles/{cat:[a-z]+}/{id:[0-9]+}`)``` | Match request prefix path. It accepts a sequence of literal and regular expression prefix paths. |
| ```Path(`/path`, `/articles/{cat:[a-z]+}/{id:[0-9]+}`, ...)``` | Match exact request path. See "Regexp Syntax" below. |
| ```PathPrefix(`/products/`, `/articles/{cat:[a-z]+}/{id:[0-9]+}`)``` | Match request prefix path. See "Regexp Syntax" below. |
| ```Query(`foo=bar`, `bar=baz`)``` | Match Query String parameters. It accepts a sequence of key=value pairs. |
| ```ClientIP(`10.0.0.0/16`, `::1`)``` | Match if the request client IP is one of the given IP/CIDR. It accepts IPv4, IPv6 and CIDR formats. |
@ -249,10 +249,11 @@ The table below lists all the available matchers:
!!! important "Regexp Syntax"
`HostRegexp` and `Path` accept an expression with zero or more groups enclosed by curly braces.
Named groups can be like `{name:pattern}` that matches the given regexp pattern or like `{name}` that matches anything until the next dot.
The group name (`name` in the above examples) is an arbitrary value.
Any pattern supported by [Go's regexp package](https://golang.org/pkg/regexp/) may be used (example: `{subdomain:[a-z]+}.{domain}.com`).
`HostRegexp`, `PathPrefix`, and `Path` accept an expression with zero or more groups enclosed by curly braces, which are called named regexps.
Named regexps, of the form `{name:regexp}`, are the only expressions considered for regexp matching.
The regexp name (`name` in the above example) is an arbitrary value, that exists only for historical reasons.
Any `regexp` supported by [Go's regexp package](https://golang.org/pkg/regexp/) may be used.
!!! info "Combining Matchers Using Operators and Parenthesis"