diff --git a/contrib/danbooru_api/main.php b/contrib/danbooru_api/main.php
index 6ea4ae4d..1f1fc5cb 100644
--- a/contrib/danbooru_api/main.php
+++ b/contrib/danbooru_api/main.php
@@ -58,7 +58,7 @@ class DanbooruApi implements Extension
 		if($event instanceof SearchTermParseEvent)
 		{
 			$matches = array();
-			if(preg_match("/md5:([0-9a-fA-F]*)/i", $event->term, $matches))
+			if(preg_match("/^md5:([0-9a-fA-F]*)$/i", $event->term, $matches))
 			{
 				$hash = strtolower($matches[1]);
 				$event->set_querylet(new Querylet("images.hash = '$hash'"));
diff --git a/contrib/numeric_score/main.php b/contrib/numeric_score/main.php
index 41892c81..29cc6121 100644
--- a/contrib/numeric_score/main.php
+++ b/contrib/numeric_score/main.php
@@ -77,7 +77,7 @@ class NumericScore implements Extension {
 
 		if($event instanceof SearchTermParseEvent) {
 			$matches = array();
-			if(preg_match("/score(<|<=|=|>=|>)(\d+)/", $event->term, $matches)) {
+			if(preg_match("/^score(<|<=|=|>=|>)(\d+)$/", $event->term, $matches)) {
 				$cmp = $matches[1];
 				$score = $matches[2];
 				$event->set_querylet(new Querylet("numeric_score $cmp $score"));
diff --git a/contrib/rating/main.php b/contrib/rating/main.php
index 63e4023f..2f320185 100644
--- a/contrib/rating/main.php
+++ b/contrib/rating/main.php
@@ -84,7 +84,7 @@ class Ratings implements Extension {
 				$set = join(', ', $arr);
 				$event->add_querylet(new Querylet("rating IN ($set)"));
 			}
-			if(preg_match("/rating=([sqe]+)/", $event->term, $matches)) {
+			if(preg_match("/^rating=([sqeu]+)$/", $event->term, $matches)) {
 				$sqes = $matches[1];
 				$arr = array();
 				for($i=0; $i<strlen($sqes); $i++) {
diff --git a/ext/index/main.php b/ext/index/main.php
index a95806db..2cac858e 100644
--- a/ext/index/main.php
+++ b/ext/index/main.php
@@ -104,35 +104,35 @@ class Index implements Extension {
 
 		if($event instanceof SearchTermParseEvent) {
 			$matches = array();
-			if(preg_match("/size(<|>|<=|>=|=)(\d+)x(\d+)/", $event->term, $matches)) {
+			if(preg_match("/^size(<|>|<=|>=|=)(\d+)x(\d+)$/", $event->term, $matches)) {
 				$cmp = $matches[1];
 				$args = array(int_escape($matches[2]), int_escape($matches[3]));
 				$event->add_querylet(new Querylet("width $cmp ? AND height $cmp ?", $args));
 			}
-			else if(preg_match("/ratio(<|>|<=|>=|=)(\d+):(\d+)/", $event->term, $matches)) {
+			else if(preg_match("/^ratio(<|>|<=|>=|=)(\d+):(\d+)$/", $event->term, $matches)) {
 				$cmp = $matches[1];
 				$args = array(int_escape($matches[2]), int_escape($matches[3]));
 				$event->add_querylet(new Querylet("width / height $cmp ? / ?", $args));
 			}
-			else if(preg_match("/(filesize|id)(<|>|<=|>=|=)(\d+[kmg]?b?)/i", $event->term, $matches)) {
+			else if(preg_match("/^(filesize|id)(<|>|<=|>=|=)(\d+[kmg]?b?)$/i", $event->term, $matches)) {
 				$col = $matches[1];
 				$cmp = $matches[2];
 				$val = parse_shorthand_int($matches[3]);
 				$event->add_querylet(new Querylet("images.$col $cmp ?", array($val)));
 			}
-			else if(preg_match("/hash=([0-9a-fA-F]*)/i", $event->term, $matches)) {
+			else if(preg_match("/^hash=([0-9a-fA-F]*)$/i", $event->term, $matches)) {
 				$hash = strtolower($matches[2]);
 				$event->add_querylet(new Querylet("images.hash = '$hash'"));
 			}
-			else if(preg_match("/(filetype|ext)=([a-zA-Z0-9]*)/i", $event->term, $matches)) {
+			else if(preg_match("/^(filetype|ext)=([a-zA-Z0-9]*)$/i", $event->term, $matches)) {
 				$ext = strtolower($matches[2]);
 				$event->add_querylet(new Querylet("images.ext = '$ext'"));
 			}
-			else if(preg_match("/(filename|name)=([a-zA-Z0-9]*)/i", $event->term, $matches)) {
+			else if(preg_match("/^(filename|name)=([a-zA-Z0-9]*)$/i", $event->term, $matches)) {
 				$filename = strtolower($matches[2]);
 				$event->add_querylet(new Querylet("images.filename LIKE '%$filename%'"));
 			}
-			else if(preg_match("/posted=(([0-9\*]*)?(-[0-9\*]*)?(-[0-9\*]*)?)/", $event->term, $matches)) {
+			else if(preg_match("/^posted=(([0-9\*]*)?(-[0-9\*]*)?(-[0-9\*]*)?)$/", $event->term, $matches)) {
 				$val = str_replace("*", "%", $matches[1]);
 				$img_search->append(new Querylet("images.posted LIKE '%$val%'"));
 			}
diff --git a/ext/user/main.php b/ext/user/main.php
index bfacdb1f..1b953d78 100644
--- a/ext/user/main.php
+++ b/ext/user/main.php
@@ -166,7 +166,7 @@ class UserPage implements Extension {
 
 		if($event instanceof SearchTermParseEvent) {
 			$matches = array();
-			if(preg_match("/(poster|user)=(.*)/i", $event->term, $matches)) {
+			if(preg_match("/^(poster|user)=(.*)$/i", $event->term, $matches)) {
 				global $config;
 				global $database;
 				$user = User::by_name($config, $database, $matches[2]);
@@ -178,7 +178,7 @@ class UserPage implements Extension {
 				}
 				$event->add_querylet(new Querylet("images.owner_id = $user_id"));
 			}
-			else if(preg_match("/(poster|user)_id=([0-9]+)/i", $event->term, $matches)) {
+			else if(preg_match("/^(poster|user)_id=([0-9]+)$/i", $event->term, $matches)) {
 				$user_id = int_escape($matches[2]);
 				$event->add_querylet(new Querylet("images.owner_id = $user_id"));
 			}