insensitive.diff

diff --git a/lib/Mojo/DOM/CSS.pm b/lib/Mojo/DOM/CSS.pm
index 45d9ee2..c46827f 100644
--- a/lib/Mojo/DOM/CSS.pm
+++ b/lib/Mojo/DOM/CSS.pm
@@ -10,7 +10,8 @@ my $ATTR_RE   = qr/
   (?:
     (\W)?                            # Operator
     =
-    (?:"((?:\\"|[^"])*)"|([^\]]+))   # Value
+    (?:"((?:\\"|[^"])*)"|([^\]]+?))  # Value
+    (?:\s+(i))?                      # Case-insensitive
   )?
   \]
 /x;
@@ -82,7 +83,7 @@ sub _compile {
   my $pattern = [[]];
   while ($css =~ /$TOKEN_RE/go) {
     my ($separator, $element, $pc, $attrs, $combinator)
-      = ($1, $2 // '', $3, $6, $11);
+      = ($1, $2 // '', $3, $6, $12);
 
     next unless $separator || $element || $pc || $attrs || $combinator;
 
@@ -109,7 +110,7 @@ sub _compile {
       while $pc =~ /$PSEUDO_CLASS_RE/go;
 
     # Attributes
-    push @$selector, ['attr', _name($1), _value($2 // '', $3 // $4)]
+    push @$selector, ['attr', _name($1), _value($2 // '', $3 // $4, $5)]
       while $attrs =~ /$ATTR_RE/go;
 
     # Combinator
@@ -279,7 +280,7 @@ sub _unescape {
 }
 
 sub _value {
-  my ($op, $value) = @_;
+  my ($op, $value, $ci) = @_;
   return undef unless defined $value;
   $value = quotemeta _unescape($value);
 
@@ -296,7 +297,7 @@ sub _value {
   return qr/$value$/ if $op eq '$';
 
   # Everything else
-  return qr/^$value$/;
+  return $ci ? qr/^$value$/i : qr/^$value$/;
 }
 
 1;