diff --git a/nselib/data/http-devframework-fingerprints.lua b/nselib/data/http-devframework-fingerprints.lua
index 09179bd82..e5836040b 100644
--- a/nselib/data/http-devframework-fingerprints.lua
+++ b/nselib/data/http-devframework-fingerprints.lua
@@ -232,7 +232,7 @@ tools = { Django = { rapidDetect = function(host, port)
                         consumingDetect = function(page, path)
                             if page then
                                 if string.find(page, "content=[\"']WordPress") or 
-                                    string.find(page, "wp-content") then
+                                    string.find(page, "wp%-content") then
                                     return "Wordpress detected. Found common traces on " .. page
                                 end
                             end
diff --git a/nselib/ftp.lua b/nselib/ftp.lua
index f8bfe92b2..f962af06c 100644
--- a/nselib/ftp.lua
+++ b/nselib/ftp.lua
@@ -57,7 +57,7 @@ function read_reply(buffer)
 	end
 
 	-- Multi-line response?
-	_, p, code, message = string.find(line, "^(%d%d%d)-(.*)$")
+	_, p, code, message = string.find(line, "^(%d%d%d)%-(.*)$")
 	if p then
 	while true do
 		line, err = buffer()
diff --git a/nselib/msrpctypes.lua b/nselib/msrpctypes.lua
index b9a692c9e..a93334a27 100644
--- a/nselib/msrpctypes.lua
+++ b/nselib/msrpctypes.lua
@@ -1571,11 +1571,11 @@ function marshall_dom_sid2(sid)
 	stdnse.print_debug(4, string.format("MSRPC: Entering marshall_dom_sid2()"))
 
 
-	if(string.find(sid, "^S-") == nil) then
+	if(string.find(sid, "^S%-") == nil) then
 		stdnse.print_debug(1, "MSRPC: ERROR: Invalid SID encountered: %s\n", sid)
 		return nil
 	end
-	if(string.find(sid, "-%d+$") == nil) then
+	if(string.find(sid, "%-%d+$") == nil) then
 		stdnse.print_debug(1, "MSRPC: ERROR: Invalid SID encountered: %s\n", sid)
 		return nil
 	end
diff --git a/scripts/http-waf-fingerprint.nse b/scripts/http-waf-fingerprint.nse
index 2c6bb7d0b..05b2455b3 100644
--- a/scripts/http-waf-fingerprint.nse
+++ b/scripts/http-waf-fingerprint.nse
@@ -334,7 +334,7 @@ netscaler = {
 
             -- TODO Check for other version detection possibilities
             -- based on fingerprint difference
-            if response.header.via and string.find(response.header.via, 'NS-CACHE') then -- 
+            if response.header.via and string.find(response.header.via, 'NS%-CACHE') then -- 
                 stdnse.print_debug("%s Citrix Netscaler detected through Via Header.", SCRIPT_NAME)
                 netscaler.version = string.sub(response.header.via, 10, 12)
                 netscaler.detected = true
diff --git a/scripts/smb-enum-sessions.nse b/scripts/smb-enum-sessions.nse
index e3310864f..5de76c844 100644
--- a/scripts/smb-enum-sessions.nse
+++ b/scripts/smb-enum-sessions.nse
@@ -215,7 +215,7 @@ local function winreg_enum_rids(host)
 	for i = 1, #elements, 1 do
 		if(elements[i]['name'] ~= nil) then
 			local sid = elements[i]['name']
-		    if(string.find(sid, "^S-") ~= nil and string.find(sid, "-%d+$") ~= nil) then
+		    if(string.find(sid, "^S%-") ~= nil and string.find(sid, "%-%d+$") ~= nil) then
 				-- The rid is the last digits before the end of the string
 				local rid = string.sub(sid, string.find(sid, "%d+$"))