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52 lines
1.5 KiB
Markdown
52 lines
1.5 KiB
Markdown
# libr3
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### what's libr3?
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[libr3](https://github.com/c9s/r3) is a high-performance path dispatching library. It compiles your route paths into a prefix tree (trie).
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APISIX using [lua-resty-libr3](https://github.com/iresty/lua-resty-libr3) as route dispatching library.
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### How to use libr3 in APISIX?
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libr3 supports PCRE(Perl Compatible Regular Expressions), so you can use route flexibly.
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Let's take a look at a few examples and have an intuitive understanding.
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1. default regular expression
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`/blog/post/{id}`
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there is not regular expression included, and `[^/]+` will be the default
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regular expression of `id`.
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So `/blog/post/{id}` is equivalent to `/blog/post/{id:[^/]+}`.
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2. match all uris
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`/{:.*}`
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`/` matches root uri, and `.*` matches any character (except for line terminators).
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`:` means is an anonymous match, for example the uri is `/blog/post/1`, the libr3 will return `[/blog/post/1]` if pattern is `/{:.*}`, and return `{"uri":"/blog/post/1"}` if pattern is `/{uri:.*}`.
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3. match number
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`/blog/post/{id:\d+}`
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for example the uri is `/blog/post/1`, libr3 will return `{"id":"1"}`.
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4. match characters
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`/blog/post/{name:\w+}`
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for example the uri is `/blog/post/foo`, libr3 will return `{"name":"foo"}`.
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5. match multiple uri segments
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`/blog/post/{name:\w+}/{id:\d+}`
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for example the uri is `/blog/post/foo/12`, libr3 will return `{"name":"foo", "id":"12"}`.
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`/blog/post/{:\w+}/{id:\d+}`
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for example the uri is `/blog/post/foo/12`, libr3 will return `{"1":"foo", "id":"12"}`.
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