[p5regex] implement \A, \z and \Z

also add some basic tests

src/QRegex/P5Regex/Actions.nqp

@@ -168,6 +168,11 @@ class QRegex::P5Regex::Actions is HLL::Actions {
                 QAST::Regex.new( :rxtype<altseq>, |@alts );
         make $qast;
     }
+
+    method p5backslash:sym<A>($/) {
+                make QAST::Regex.new( :rxtype<anchor>, :subtype<bos>, :node($/) );
+
+    }
     
     method p5backslash:sym<s>($/) {
         make QAST::Regex.new(:rxtype<cclass>, '.CCLASS_WHITESPACE', 
@@ -181,6 +186,21 @@ class QRegex::P5Regex::Actions is HLL::Actions {
                              QAST::Node.new( QAST::SVal.new( :value('wb') ) ));
     }
     
+    method p5backslash:sym<z>($/) {
+        make QAST::Regex.new( :rxtype<anchor>, :subtype<eos>, :node($/) );
+    }
+
+    method p5backslash:sym<Z>($/) {
+        make QAST::Regex.new(
+            :rxtype('concat'),
+            QAST::Regex.new(
+                :rxtype('quant'), :min(0), :max(1),
+                QAST::Regex.new( :rxtype('literal'), "\n" )
+            ),
+            QAST::Regex.new( :rxtype<anchor>, :subtype('eos'), :node($/) )
+        );
+    }
+
     method p5backslash:sym<misc>($/) {
         if $<litchar> {
             make QAST::Regex.new( ~$<litchar> , :rxtype('literal'), :node($/) );

src/QRegex/P5Regex/Grammar.nqp

@@ -81,6 +81,9 @@ grammar QRegex::P5Regex::Grammar is HLL::Grammar {
 
     proto token p5backslash { <...> }
     
+    token p5backslash:sym<A> { <sym> }
+    token p5backslash:sym<z> { <sym> }
+    token p5backslash:sym<Z> { <sym> }
     token p5backslash:sym<b> { $<sym>=[<[bB]>] }
     token p5backslash:sym<s> { $<sym>=[<[dDnNsSwW]>] }
     token p5backslash:sym<misc> { $<litchar>=(\W) | $<number>=(\d+) }

t/p5regex/rx_metachars

@@ -47,3 +47,10 @@ ab\d+cdef		ab42cdef	y	digit
 a\D+f			abcdef		y	not digit
 a\D+f			ab0cdef		n	not digit
 \Ba\B			a-		n	not boundary
+a\Z				a\n		y	basic \Z + (1)
+a\Z				a		y	basic \Z + (2)
+a\Z				ab		n	basic \Z - (1)
+a\Z				a\nb	n	basic \Z - (2)
+a\z				a		y	basic \z +
+a\z				a\n		n	basic \z - (1)
+a\z				a\nb	n	basic \z - (2)