javascript - how to create patterns in TextBox? -


notes : tired questions & answer related topic. this

i use simple form use url textbox use patterns pattern="https?://.+" perfect work.

i want allow text (small & uppercase) like 

1. www.test.com 2. https://www.test.com 3. https://test.com 4. www.test.com 5. https://www.test.com* 6. http://test.com

i tried code : 

<input name="website" id="website" type="text" class="custom_textbox"  pattern="https?://.+"/>

notes: using pattern try solve problem. not other script

my code here

you may use alternation this:

pattern="(www\.|https?://).+"          ^     ^         ^

a case-insensitive version:

pattern="([ww][ww][ww]\.|[hh][tt][tt][pp][ss]?://).+"

see regex demo. note case insensitive version can shortened of limiting quantifiers: pattern="([ww]{3}\.|[hh][tt]{2}[pp][ss]?://).+".

it accept input starting www. or http:// or https://.

input:valid {    color: black;  }  input:invalid {    color: red;  }
<form name="form1">     <input name="website" id="website" type="text" class="custom_textbox"       pattern="([ww][ww][ww]\.|[hh][tt][tt][pp][ss]?://).+"        title="please valid url" required/>    <input type="submit"/>   </form>


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