Add Named Regex Captures Are Assigned To Variables as a ruby til

README.md

@@ -9,7 +9,7 @@ and pairing with smart people at Hashrocket.
 
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@@ -808,6 +808,7 @@ _978 TILs and counting..._
 - [Map With Index Over An Array](ruby/map-with-index-over-an-array.md)
 - [Mock Method Chain Calls With RSpec](ruby/mock-method-chain-calls-with-rspec.md)
 - [Mocking Requests With Partial URIs Using Regex](ruby/mocking-requests-with-partial-uris-using-regex.md)
+- [Named Regex Captures Are Assigned To Variables](ruby/named-regex-captures-are-assigned-to-variables.md)
 - [Navigate Back In The Browser With Capybara](ruby/navigate-back-in-the-browser-with-capybara.md)
 - [Next And Previous Floats](ruby/next-and-previous-floats.md)
 - [Or Operator Precedence](ruby/or-operator-precedence.md)

ruby/named-regex-captures-are-assigned-to-variables.md

@@ -0,0 +1,24 @@
+# Named Regex Captures Are Assigned To Variables
+
+Both `String` and `Regexp` include the `=~` operator as a way of checking if a
+string and a regex match.
+
+When the `Regexp` version of
+[`=~`](https://ruby-doc.org/core-2.5.1/Regexp.html#method-i-3D~) with named
+capture groups, those named captures will be auto-assigned as local variables.
+
+Here is a regex that includes a named capture: `(?<id>\d+)`. The parentheses
+define the capture area and the `?<id>` specifies that whatever follows in the
+capture will be named `id`.
+
+```
+/Tile: (?<id>\d+)/ =~ 'Tile: 1234'
+#=> 0
+id
+=> "1234"
+```
+
+After the match operator (`=~`) runs in the first line, the local variable `id`
+gets assigned to whatever it matches in the corresponding string.
+
+[source](https://ruby-doc.org/core-2.5.1/Regexp.html#class-Regexp-label-Capturing)