Ignore negative text requirements when extracting strings from regexps

lib/capybara/selector/regexp_disassembler.rb

@@ -100,6 +100,8 @@ def initialize(exp)
         def extract_strings(process_alternatives)
           strings = []
           each do |exp|
+            next if exp.ignore?
+
             next strings.push(nil) if exp.optional? && !process_alternatives
 
             next strings.push(exp.alternative_strings) if exp.alternation? && process_alternatives
@@ -159,6 +161,11 @@ def alternative_strings
           alts.all?(&:any?) ? Set.new(alts) : nil
         end
 
+        def ignore?
+          [Regexp::Expression::Assertion::NegativeLookahead,
+           Regexp::Expression::Assertion::NegativeLookbehind].any? { |klass| @exp.is_a? klass }
+        end
+
       private
 
         def indeterminate?

spec/regexp_dissassembler_spec.rb

@@ -212,6 +212,16 @@
     )
   end
 
+  it 'ignores negative lookaheads' do
+    verify_strings(
+      /^(?!.*\bContributing Editor\b).*$/ => %w[],
+      /abc(?!.*def).*/ => %w[abc],
+      /(?!.*def)abc/ => %w[abc],
+      /abc(?!.*def.*).*ghi/ => %w[abc ghi],
+      /abc(?!.*bcd)def/ => %w[abcdef]
+    )
+  end
+
   it 'handles anchors' do
     verify_strings(
       /^abc/ => %w[abc],