Summary of common Regular Expressions (comparison between JS and C ).

Last Update:2018-12-05 Source: Internet

Author: User

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JS uses R. Test () and C # uses RegEx. ismatch () to verify the regular expression.

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<% @ Page Language = "C #" autoeventwireup = "true" codefile = "regextest. aspx. cs" inherits = "regextest" %>

<! Doctype HTML public "-// W3C // dtd xhtml 1.0 transitional // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<Title> Summary of common Regular Expressions </title>

Function fcheck (){

// Check the user name

VaR uname = jquery ("# txtusername"). Val ();

If (uname = "") {alert ('user name cannot be blank! '); Return false ;}

R =/^ [\ W \ D] {4, 16} $ /;

If (! R. Test (uname) {alert ('user name is 4-16 characters! '); Return false ;}

// Check the password

VaR upwd = jquery ("# txtpwd"). Val ();

If (upwd = "") {alert ('password cannot be blank! '); Return false ;}

R =/^. {6, 14} $ /;

If (! R. Test (upwd) {alert ('password is 6-14 characters! '); Return false ;}

If (jquery ("# txtpwdconfirm"). Val ()! = Upwd) {alert ('the passwords entered twice are inconsistent! '); Return false ;}

// Check the email address

VaR uemail = jquery ("# txtemail"). Val ();

If (uemail = "") {alert ('email address cannot be blank! '); Return false ;}

R =/^ \ W + ([-+.] \ W +) * @ \ W + ([-.] \ W + )*\. \ W + ([-.] \ W +) * $ /;

If (! R. Test (uemail) {alert ('email address format is incorrect! '); Return false ;}

Return true;

}

</SCRIPT>

</Head>

<Body>

<Div>

User name:

<Asp: textbox id = "txtusername" runat = "server"> </ASP: textbox>

4-16 characters (numbers, letters, and underscores) <br/>

Password and Confirm Password: <asp: textbox id = "txtpwd" runat = "server" textmode = "password" width = "80px"> </ASP: textbox>

<Asp: textbox id = "txtpwdconfirm" runat = "server" textmode = "password" width = "80px"> </ASP: textbox>

<Br/>

Email Address:

<Asp: textbox id = "txtemail" runat = "server"> </ASP: textbox> (enter a valid email address, which is used when the password is lost)

<Br/>

<Asp: button onclientclick = "" id = "btnregister" runat = "server" text = "agree to the following agreement and register" onclick = "btnregister_click"/>

</Div>

</Form>

</Body>

</Html>

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Using system;

Using system. Data;

Using system. configuration;

Using system. collections;

Using system. Web;

Using system. Web. Security;

Using system. Web. UI;

Using system. Web. UI. webcontrols;

Using system. Web. UI. webcontrols. webparts;

Using system. Web. UI. htmlcontrols;

Using system. Text. regularexpressions;

Public partial class regextest: system. Web. UI. Page

{

Protected void page_load (Object sender, eventargs E)

{

}

/*************************************** *************

* ^ Match start $ match end

* {M, n} matches the expression from m to N. For example, [\ W] {4, 16} matches 4 to 16 letters.

*. Match any single character except "\ n.

* To match any character including '\ n', use the mode like' [. \ n.

* [-+.] Three symbols can only be one.

**************************************** ***********/

Protected void btnregister_click (Object sender, eventargs E)

{

// The username must be 4-16 characters long (numbers, letters, and underscores)

RegEx = new RegEx (@ "^ [\ W \ D] {4, 16} $ ");

If (! RegEx. ismatch (txtusername. Text. Trim ()))

{

Page. clientscript. registerclientscriptblock (this. GetType (), "alert", "<SCRIPT> alert ('user name is 4-16 characters (numbers, letters, and underscores ). '); </SCRIPT> ", false );

Return;

}

// The password is 6-14 characters long!

RegEx = new RegEx (@ "^. {6, 14} $ ");

If (! RegEx. ismatch (txtpwd. Text. Trim ()))

{

Page. clientscript. registerclientscriptblock (this. GetType (), "alert", "<SCRIPT> alert ('password is 6-14 characters! '); </SCRIPT> ", false );

Return;

}

// The password is 6-14 characters long!

RegEx = new RegEx (@ "^ \ W + ([-+.] \ W +) * @ \ W + ([-.] \ W + )*\. \ W + ([-.] \ W +) * $ ");

If (! RegEx. ismatch (txtemail. Text. Trim ()))

{

Page. clientscript. registerclientscriptblock (this. GetType (), "alert", "<SCRIPT> alert ('email address format is incorrect! '); </SCRIPT> ", false );

Return;

}

Page. clientscript. registerclientscriptblock (this. GetType (), "alert", "<SCRIPT> alert ('registration successful! Please log on. '); Window. Location. href = 'login. aspx'; </SCRIPT> ", false );

}

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