Don't instantiate or use Regexp when string.start_with? will do (#3177)

Co-authored-by: Cameron Dutro <camertron@gmail.com>

Author: mathias

.changeset/chilly-rocks-compare.md

@@ -0,0 +1,5 @@
+---
+'@primer/view-components': patch
+---
+
+Switch Ruby match from Regexps to String's starts_with method

lib/primer/classify/utilities.rb

@@ -18,18 +18,18 @@ class Utilities
 
       # Replacements for some classnames that end up being a different argument key
       REPLACEMENT_KEYS = {
-        Regexp.new("^f") => "font_size",
-        Regexp.new("^anim") => "animation",
-        Regexp.new("^v-align") => "vertical_align",
-        Regexp.new("^d") => "display",
-        Regexp.new("^wb") => "word_break",
-        Regexp.new("^v") => "visibility",
-        Regexp.new("^width") => "w",
-        Regexp.new("^height") => "h",
-        Regexp.new("^color-bg") => "bg",
-        Regexp.new("^color-border") => "border_color",
-        Regexp.new("^color-fg") => "color",
-        Regexp.new("^rounded") => "border_radius"
+        "f" => "font_size",
+        "anim" => "animation",
+        "v-align" => "vertical_align",
+        "d" => "display",
+        "wb" => "word_break",
+        "v" => "visibility",
+        "width" => "w",
+        "height" => "h",
+        "color-bg" => "bg",
+        "color-border" => "border_color",
+        "color-fg" => "color",
+        "rounded" => "border_radius"
       }.freeze
 
       SUPPORTED_KEY_CACHE = Hash.new { |h, k| h[k] = !UTILITIES[k].nil? }
@@ -190,7 +190,7 @@ def find_selector(selector)
 
         def infer_selector_key(selector)
           REPLACEMENT_KEYS.each do |k, v|
-            return v.to_sym if selector.match?(k)
+            return v.to_sym if selector.start_with?(k)
           end
           selector.split("-").first.to_sym
         end

lib/tasks/utilities.rake

@@ -52,10 +52,10 @@ namespace :utilities do
 
       # Look for a replacement key
       Primer::Classify::Utilities::REPLACEMENT_KEYS.each do |k, v|
-        next unless classname.match?(Regexp.new(k))
+        next unless classname.start_with?(k)
 
         key = v
-        classname.sub!(Regexp.new("#{k}-"), "")
+        classname.sub!(Regexp.new("\A#{k}-"), "")
       end
 
       # If we didn't find a replacement, grab the first text before hyphen

test/lib/css_coverage_test.rb

@@ -29,7 +29,7 @@ def setup
     # Cleanup the data to make sure it's only one selector per item
     @css_data = @css_data
                 .flat_map { |c| c.gsub(/(\w)\./, '\1 .').split(/[\s:\[+>]+/) }
-                .select { |c| c.starts_with?(".") }
+                .select { |c| c.start_with?(".") }
                 .uniq
   end