Fix to use POSIX compatible regex

Author: iliaross

generate-lemp.sh

@@ -8,8 +8,8 @@ for i in *.ctl; do
   sed -i "s/virtualmin-lamp-stack/virtualmin-lemp-stack/" "$lempname"
   sed -i "s/LAMP/LEMP/g" "$lempname"
   sed -i "s/apache2\s*$/nginx-full | nginx-extras, webmin-virtualmin-nginx, webmin-virtualmin-nginx-ssl/" "$lempname"
-  sed -i "s/libapache2-mod-fcgid(?:,\s*)?//" "$lempname"
-  sed -i "s/apache2-suexec-custom(?:,\s*)?//" "$lempname"
+  sed -i "s/libapache2-mod-fcgid,\{0,1\}[[:space:]]*//" "$lempname"
+  sed -i "s/apache2-suexec-custom,\{0,1\}[[:space:]]*//" "$lempname"
   echo ' .' >> $lempname
   echo ' This file auto-generated by generate-lemp.sh' >> $lempname
 done