diff --git a/mkdocs/achandling.md b/mkdocs/achandling.md
index 2b6af1a..121b299 100644
--- a/mkdocs/achandling.md
+++ b/mkdocs/achandling.md
@@ -396,7 +396,7 @@ An above example is the most simple sketch of handling values entered into a cus
 
 Another method is effective when custom Web pages have complicated page transitions. It is a way to straight access the AutoConnectElements member value. You can get the AutoConnectElement with the specified name using the [getElement](#get-autoconnectelement-from-the-autoconnectaux) function. The following sketch executes the above example with AutoConnect only, without using the function of ESP8266WebServer.
 
-```cpp hl_lines="47 50"
+```cpp hl_lines="48 51"
 #include <ESP8266WiFi.h>
 #include <ESP8266WebServer.h>
 #include <AutoConnect.h>
@@ -693,7 +693,7 @@ void loop() {
 
 ### <i class="far fa-check-square"></i> Check data against on submission
 
-By giving a [pattern](apielements.md#pattern) to [AutoConnectInput](apielements.md#autoconnectinput), you can find errors in data styles while typing in custom Web pages. The pattern is specified by [regular expression](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions).[^2] If the value during input of AutoConnectInput does not match the regular expression specified in the pattern, its background color changes to pink. The following example shows the behavior when checking the IP address in the AutoConnectInput field.
+By giving a [pattern](apielements.md#pattern) to [AutoConnectInput](apielements.md#autoconnectinput), you can find errors in data styles while typing in custom Web pages. The pattern is specified with [regular expression](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions).[^2] If the value during input of AutoConnectInput does not match the regular expression specified in the pattern, its background color changes to pink. The following example shows the behavior when checking the IP address in the AutoConnectInput field.
 
 [^2]:Regular expression specification as a pattern of AutoConnectInput is [JavaScript compliant](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions).
 
@@ -718,7 +718,7 @@ By giving a [pattern](apielements.md#pattern) to [AutoConnectInput](apielements.
   <span style="display:block;width:306px;height:136px;border:1px solid lightgrey;"><img data-gifffer="images/aux_pattern.gif" data-gifffer-height="134" data-gifffer-width="304" /></span>
 </div>
 
-If you are not familiar with regular expressions, you may feel that description very strange. And matter of fact, it is a strange description for those unfamiliar with formal languages. If your regular expression can not interpret the intended syntax and semantics, you can use an online tester. The [regex101](https://regex101.com/) is an exceptional online site for testing and debugging regular expressions.
+If you are not familiar with regular expressions, you may feel that description very strange. Matter of fact, it's a strange description for those who are unfamiliar with the formal languages. If your regular expression can not interpret the intended syntax and semantics, you can use an online tester. The [regex101](https://regex101.com/) is an exceptional online tool for testing and debugging regular expressions.
 
 ### <img src="images/regexp.png" align="top"> Validate input data