diff --git a/code/plugins/authorizenet/authorizenet/tmpl/default.php b/code/plugins/authorizenet/authorizenet/tmpl/default.php
index 58d643f1..52ffca19 100755
--- a/code/plugins/authorizenet/authorizenet/tmpl/default.php
+++ b/code/plugins/authorizenet/authorizenet/tmpl/default.php
@@ -91,7 +91,7 @@ function plg_auth_showHide()
 						<?php echo JText::_('FIRST_NAME') . JText::_('PLG_PAYMENT_AUTHORIZENET_REQUIRED_MARK'); ?>
 					</label>
 					<div class="controls">
-						<input class="inputbox required" id="cardfname" type="text" name="cardfname" size="35" value="<?php echo !empty($userInfo['firstname']) ?$userInfo['firstname']:'';?>" />
+						<input class="inputbox required" id="cardfname" type="text" name="cardfname" size="35" value="<?php echo !empty($userInfo['firstname']) ?$userInfo['firstname']:'';?>" pattern="[a-zA-Z0-9\s\.]+"/>
 					</div>
 				</div>
 
@@ -99,7 +99,7 @@ function plg_auth_showHide()
 					<label for="cardlname" class="control-label">
 						<?php echo JText::_('LAST_NAME') . JText::_('PLG_PAYMENT_AUTHORIZENET_REQUIRED_MARK'); ?>
 					</label>
-					<div class="controls"><input class="inputbox required" id="cardlname" type="text" name="cardlname" size="35" value="<?php echo !empty($userInfo['lastname']) ?$userInfo['lastname']:''; ?>" /></div>
+					<div class="controls"><input class="inputbox required" id="cardlname" type="text" name="cardlname" size="35" value="<?php echo !empty($userInfo['lastname']) ?$userInfo['lastname']:''; ?>" pattern="[a-zA-Z0-9\s\.]+"/></div>
 				</div>
 
 				<div class="control-group">
diff --git a/code/plugins/authorizenet/authorizenet/tmpl/default_bs3.php b/code/plugins/authorizenet/authorizenet/tmpl/default_bs3.php
index 5f505d29..c5dd092b 100755
--- a/code/plugins/authorizenet/authorizenet/tmpl/default_bs3.php
+++ b/code/plugins/authorizenet/authorizenet/tmpl/default_bs3.php
@@ -80,11 +80,11 @@ function plg_auth_showHide()
 		 <div id="tj_payGway_billInfo" style="display:<?php echo $plg_billStyle; ?>">
 			<div class="form-group">
 			   <label for="cardfname" class="col-sm-3 col-xs-12 control-label"><?php echo JText::_( 'FIRST_NAME' ) . JText::_('PLG_PAYMENT_AUTHORIZENET_REQUIRED_MARK'); ?></label>
-			   <div class="col-lg-9 col-md-9 col-sm-9 col-xs-12"><input class="inputbox required" id="cardfname" type="text" name="cardfname" size="35" value="<?php echo !empty($userInfo['firstname']) ?$userInfo['firstname']:'' ;?>" /></div>
+			   <div class="col-lg-9 col-md-9 col-sm-9 col-xs-12"><input class="inputbox required" id="cardfname" type="text" name="cardfname" size="35" value="<?php echo !empty($userInfo['firstname']) ?$userInfo['firstname']:'' ;?>" pattern="[a-zA-Z0-9\s\.]+"/></div>
 			</div>
 			<div class="form-group">
 			   <label for="cardlname" class="col-sm-3 col-xs-12 control-label"><?php echo JText::_( 'LAST_NAME' ) . JText::_('PLG_PAYMENT_AUTHORIZENET_REQUIRED_MARK'); ?></label>
-			   <div class="col-lg-9 col-md-9 col-sm-9 col-xs-12"><input class="inputbox required" id="cardlname" type="text" name="cardlname" size="35" value="<?php echo !empty($userInfo['lastname']) ?$userInfo['lastname']:'' ;?>" /></div>
+			   <div class="col-lg-9 col-md-9 col-sm-9 col-xs-12"><input class="inputbox required" id="cardlname" type="text" name="cardlname" size="35" value="<?php echo !empty($userInfo['lastname']) ?$userInfo['lastname']:'' ;?>" pattern="[a-zA-Z0-9\s\.]+"/></div>
 			</div>
 			<div class="form-group">
 			   <label for="cardaddress1" class="col-sm-3 col-xs-12 control-label"><?php echo JText::_( 'STREET_ADDRESS' ) . JText::_('PLG_PAYMENT_AUTHORIZENET_REQUIRED_MARK'); ?></label>