alphanumeric

问题 I have the following input tag in my html5 form: <p> <label>Company Name*</label> <input type="text" name="name" class="field" required pattern="[a-zA-Z0-9]+" /> </p> This works just fine checking if the company name consists out of alphanumeric characters. But of course I want to allow spaces in the company name. I need to know what I should add to the pattern. 回答1: How about adding a space in the pattern attribute like pattern="[a-zA-Z0-9 ]+" . If you want to support any kind of space try

问题 I am writing a piece of software, and It require me to handle data I get from a webpage with libcurl. When I get the data, for some reason it has extra line breaks in it. I need to figure out a way to only allow letters, numbers, and spaces. And remove everything else, including line breaks. Is there any easy way to do this? Thanks. 回答1: Write a function that takes a char and returns true if you want to remove that character or false if you want to keep it: bool my_predicate(char c); Then use

问题 I want a regular expression that prevents symbols and only allows letters and numbers. The regex below works great, but it doesn't allow for spaces between words. ^[a-zA-Z0-9_]*$ For example, when using this regular expression "HelloWorld" is fine, but "Hello World" does not match. How can I tweak it to allow spaces? 回答1: tl;dr Just add a space in your character class. ^[a-zA-Z0-9_ ]*$ Now, if you want to be strict... The above isn't exactly correct. Due to the fact that * means zero or more

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 8 years ago . I need a regular expression for: String must be Captial letters(A-Z) and contain digits (0-9) 回答1: The following should work: [A-Z0-9]+ 回答2: ^[A-Z]+[0-9]*$ Should match one or more capital letters followed by

问题 I'm looking for a decimal to alphanumeric number base converter library in Visual Basic that does not use recursion. I found: http://visualstudiomagazine.com/articles/2010/07/20/when-hexadecimal-is-not-enough.aspx which includes a demo app but discovered that it uses recursion. The problem with it using recursion became apparent when I attempted to integrate the library into my own Visual Studio Express 2010 Visual Basic project: I got a stack overflow exception. Now I could consider

问题 I want to force users to enter data in a specific cell in a sequence like ABCDE1234F i.e. first five characters must me letters then four digits and last must be a letter using custom data validation . 回答1: It is quite long: =AND(ISNUMBER(SUMPRODUCT(SEARCH("~"&MID(A1,ROW($1:$5),1),"abcdefghijklmnopqrstuvwxyz"))),ISNUMBER(SUMPRODUCT(SEARCH("~"&MID(A1,ROW($6:$9),1),"0123456789"))),ISNUMBER(SUMPRODUCT(SEARCH("~"&MID(A1,10,1),"abcdefghijklmnopqrstuvwxyz"))),LEN(A1)=10) It goes through each of the

问题 I have a description field in my database which accepts alphanumeric characters and spaces, as well as new line characters. I want to set that validation rule in my Server model. Here's what I have now: <?php class Server extends AppModel { public $validate = array( // ... 'description' => array( 'characters' => array( 'rule' => 'alphaNumeric', 'message' => 'Alphanumeric characters only' ) ), // ... ); } How can I modify this to allow spaces and new lines as well as alphanumeric characters? I

问题 I want to generate a random alphanumeric string into password field when click a button. <asp:TextBox ID="txtPassword" runat="server" TextMode="Password"></asp:TextBox> code behind the button var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; var stringChars = new char[8]; var random = new Random(); for (int i = 0; i < stringChars.Length; i++) { stringChars[i] = chars[random.Next(chars.Length)]; } var finalString = new String(stringChars); txtPassword.Text =

问题 Problem: I have to go through text file that has lines of strings and determine about each line if it is alphanumeric or not. If the line is alphanumeric print for example "5345m345ö34l is alphanumeric" Example of the text file: 5345m345ö34l no2no123non4 %#""SGMSGSER My code is as follows: file = open('file.txt','r') data = file.readlines() for i in data: i.strip() if (i.isalnum()): print (i, 'is alphanumeric') else: print (i, 'not alphanumeric') file.close() We can see that the first and

问题 I have the following kind of data A1 B1 C1 D1 II Cm2 447 I Phy Hn 60 II Cm2 457 I Phy Hn 70 II Cm2 448 I Phy Hn 61 II Cm2 458 I Phy Hn 71 II Cm2 449 I Phy Hn 62 II Cm2 459 I Phy Hn 72 II Cm2 450 I Phy Hn 63 II Cm2 460 I Phy Hn 73 II Cm2 451 I Phy Hn 64 II Cm2 461 I Phy Hn 74 II Cm2 452 I Phy Hn 65 II Cm2 462 I Phy Hn 75 II Cm2 453 I Phy Hn 66 II Cm2 463 I PHY ml 76 II Cm2 454 I Phy Hn 67 II Cm2 464 I PHY ml 77 II Cm2 455 I Phy Hn 68 II Cm2 465 I PHY ml 78 II Cm2 456 I Phy Hn 69 II Cm2 466 I