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Regular Expression for Alphabets + Numeric Value

Answer 1

+3 A:

This website will tell you exactly what you need to know.

Skilldrick 2010-08-17 11:32:54

Answer 2

+2 A:

Regexp:

var match = /^[a-zA-Z][0-9]{3}$/.test("A456"); // match is true
var match = /^[a-zA-Z][0-9]{3}$/.test("AB456"); // match is false

http://www.regular-expressions.info/javascriptexample.html - there's an online testing tool where you can check if it works all right.

MartyIX 2010-08-17 11:33:35

Are you sure `/[a-zA-Z][0-9]{3}/.test("AB456")` is false?

KennyTM 2010-08-17 11:38:23

KennyTM .. you have right, its true because its match "B456"

Floyd 2010-08-17 11:39:30

Sorry for that! This version should be all right.

MartyIX 2010-08-17 11:42:32

Sorry dear, it is not working !!!

Rahul Patil 2010-08-17 12:09:52

I don't know if your comment was before update or after.

MartyIX 2010-08-17 13:15:49

Answer 3

A:

/[A-Z][0-9]{3}/

alxx 2010-08-17 11:33:46

Answer 4

+4 A:

^[A-Z]{1}\d{3}$

or shorter

^[A-Z]\d{3}$

Description:

// ^[A-Z]\d{3}$
// 
// Assert position at the start of the string or after a line break character «^»
// Match a single character in the range between "A" and "Z" «[A-Z]»
// Match a single digit 0..9 «\d{3}»
//    Exactly 3 times «{3}»
// Assert position at the end of the string or before a line break character «$»

Test:

/*
A123 -> true
D456 -> true
AS23 -> false
1234 -> false
HJI1 -> false
AB456 -> false
*/

Floyd 2010-08-17 11:35:55

he doesn't say anything about first letter being capital (though all examples do): `/^[a-z]\d{3}$/i`

Amarghosh 2010-08-17 11:44:14

Sorry dear, it is not working !!!

Rahul Patil 2010-08-17 12:05:30

@Rahul _dear_, the regex is correct - post the code that you're using to test it.

Amarghosh 2010-08-17 12:19:27

@Amaraghosh: he doesn't say that not. all exampels he post are capital.

Floyd 2010-08-17 12:34:25

Answer 5

A:

If you want both upper and lower case letters then /^[A-Za-z][0-9]{3}$/

else if letters are upper case then /^[A-Z][0-9]{3}$/

Alex 2010-08-17 12:26:47

Answer 6

A:

Minimal example:

<html>
<head>
</head>
<body>
<form id="form" name="form" action="#">
  <input type="text" onkeyup=
   "document.getElementById('s').innerHTML=this.value.match(/^[a-z]\d\d\d$/i)?'Good':'Fail'" 
   />
  <span id="s">?</span>
</form>
</html>

Regards

rbo

rubber boots 2010-08-17 12:37:42

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Regular Expression for Alphabets + Numeric Value

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