The symbol_matchers plugin allows you do define custom regexps to use for specific symbols. For example, if you have a route such as:
r.on :username do |username| # ... end
By default this will match all nonempty segments. However, if your usernames must be 6-20 characters, and can only contain a-z
and 0-9
, you can do:
plugin :symbol_matchers symbol_matcher :username, /([a-z0-9]{6,20})/
Then the route will only if the path is /foobar123
, but not if it is /foo
, /FooBar123
, or /foobar_123
.
By default, this plugin sets up the following symbol matchers:
:d |
|
:rest |
|
:w |
|
If the placeholder_string_matchers plugin is loaded, this feature also applies to placeholders in strings, so the following:
r.on "users/:username" do |username| # ... end
Would match /users/foobar123
, but not /users/foo
, /users/FooBar123
, or /users/foobar_123
.
If using this plugin with the params_capturing plugin, this plugin should be loaded first.
Classes and Modules
Public Class methods
# File lib/roda/plugins/symbol_matchers.rb 45 def self.configure(app) 46 app.symbol_matcher(:d, /(\d+)/) 47 app.symbol_matcher(:w, /(\w+)/) 48 app.symbol_matcher(:rest, /(.*)/) 49 end
# File lib/roda/plugins/symbol_matchers.rb 41 def self.load_dependencies(app) 42 app.plugin :_symbol_regexp_matchers 43 end