diff --git a/zap b/zap
index 098e60c..e0571df 100755
--- a/zap
+++ b/zap
@@ -570,10 +570,27 @@ fi
 # portability of {} in egrep is uncertain
 dsptn='^\w[[:alnum:]_.:-]*(/[[:alnum:]_\.:-]+)*$'
 hostptn='^((\w|\w[[:alnum:]-]*\w)\.)*(\w|\w[[:alnum:]-]*\w)$'
-# https://stackoverflow.com/questions/53497/regular-expression-that-matches-valid-ipv6-addresses
-ipv4ptn='^((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])$'
-ipv6ptn='^(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))$'
-ipv4llptn='^127\.((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){2,2}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])$'
+# goo.gl/t3meuX (Stackoverflow answer about IP regexp)
+ipv4ptn="^((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|\
+1{0,1}[0-9]){0,1}[0-9])$"
+ipv6ptn="^([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|\
+([0-9a-fA-F]{1,4}:){1,7}:|\
+([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|\
+([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|\
+([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|\
+([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|\
+([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|\
+[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|\
+:((:[0-9a-fA-F]{1,4}){1,7}|:)|\
+[fF][eE]80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|\
+::([fF]{4}(:0{1,4}){0,1}:){0,1}\
+((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}\
+(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|\
+([0-9a-fA-F]{1,4}:){1,4}:\
+((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}\
+(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])$"
+iplbptn="^(127\.((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){2,2}\
+(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))$|^::1$"
 ttlptn='^[0-9]{1,4}[dwmy]$'
 unptn='^[[:alnum:]_][[:alnum:]_-]{0,31}$'
 zptn="@ZAP_(${hn})_..*--[0-9]{1,4}[dwmy]"