JavaScript中ussd代码的正则表达式

Question

My text box should only allow valid ussd code

Starts with *

Ends with #

And in the middle only * , # and 0-9 should be allow.

Answer 1

This regex works perfect for USSD shortcodes:

Regex Pattern: /^*[0-9]+(*[0-9]+)*#$/

Regex will ACCEPT the following

*1#
*12#
*123#
*123*1#
*123*12#
*123*12*1#

Regex will REJECT the following

*
#
*#
**123#
*123##
*123*#
*123*12*#

The answer marked as BEST ANSWER has limitations as it supports ****5### which was not desired in my use case. The regex I've provided does not support chaining " * " or " # " eg " ** " or " ## " shortcodes will be rejected.

Answer 2

You can use the following Regex:

^\*[0-9]+([0-9*#])*#$

The above regex checks for the following:

1. String that begins with a *.
2. Followed by at least one instance of digits and optionally * or #.
3. Ends with a #.

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In Java script, you can use this to quickly test it out:

javascript:alert(/^\*[0-9]+([0-9*#])*#$/.test('*06*#'));

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Hope this helps!

Answer 3

This should work /^\*[0-9\*#]*[0-9]+[0-9\*#]*#$/

 ussd = "*123#"; console.log((/^\*[0-9\*#]*[0-9]+[0-9\*#]*#$/).test(ussd)); ussd = "123#"; console.log((/^\*[0-9\*#]*[0-9]+[0-9\*#]*#$/).test(ussd));

Answer 4

Check here it will work for you

• Starts with *
• Ends with #
• can contain *,#, digits
• Atleast one number

 function validate(elm){ val = elm.value; if(/^\*[\*\#]*\d+[\*\#]*\#$/.test(val)){ void(0); } else{ alert("Enter Valid value"); } }

 <input type="text" onblur="validate(this);" />

Answer 5

You can try following regex:

/^\*[0-9\*#]*[0-9]+[0-9\*#]*#$/

Rules

• Starts with *
• Can have 0-9, *, #
• Must have at least 1 number
• Ends with #

 function validateUSSD(str){ var regex = /^\*[0-9\*#]*[0-9]+[0-9\*#]*#$/; var valid= regex.test(str); console.log(str, valid) return valid; } function handleClick(){ var val = document.getElementById("ussdNo").value; validateUSSD(val) } function samlpeTests(){ validateUSSD("*12344#"); validateUSSD("*#"); validateUSSD("****#"); validateUSSD("12344#"); validateUSSD("*12344"); validateUSSD("****5###"); } samlpeTests();

 <input type="text" id="ussdNo" /> <button onclick="handleClick()">Validate USSD</button>