DEV: Prefer \A and \z over ^ and $ in regexes (#19936)

app/models/concerns/has_custom_fields.rb

@@ -20,7 +20,7 @@ module HasCustomFields
 
       sorted_types = types.keys.select { |k| k.end_with?("*") }.sort_by(&:length).reverse
 
-      sorted_types.each { |t| return types[t] if key =~ /^#{t}/i }
+      sorted_types.each { |t| return types[t] if key =~ /\A#{t}/i }
 
       types[key]
     end

app/models/concerns/reports/top_uploads.rb

@@ -66,7 +66,7 @@ module Reports::TopUploads
       builder.where("up.created_at < :end_date", end_date: report.end_date)
 
       if extension_filter
-        builder.where("up.extension = :extension", extension: extension_filter.sub(/^\./, ""))
+        builder.where("up.extension = :extension", extension: extension_filter.sub(/\A\./, ""))
       end
 
       builder.query.each do |row|