CODEWITHSUNDEEP
javascriptregex
user4387564
user4387564

Reputation:

Regex for Accepting any number of Characters and -

Can any one give me correct Regular Expression to accept Name starting with characters and ending with characters, in middle i can allow - Ex: ABC or ABC-DEF or ABC-DEF-GHI But it should not start or end with - Ex: -ABC or -ABC- or ABC-

Here is my Regular Expression:

var regex = /^[A-Za-z]-?[A-Za-z]*-?([A-Za-z]+)+$/

This works perfactly fine for me, but if suppose i want to give name as AB-CD-EF-GH than this don't work. Note: Remember that Name should start with Characters and End with Characters and in between i can have - but not -- twice. It has to be associated with characters like a-b-c-d

Upvotes: 1

Views: 3217

Answers (4)

HBP
HBP

Reputation: 16033

I believe this is what you want :

  /^[A-Z](-[A-Z]+)*[A-Z]$/i

Analysis :

  /^       Start of string
  [A-Z]    Any alphabetic character
  (        Group
    -        A hyphen character
    [A-Z]+   One or more alphabetic characters
  )*       0 or more repititons of group
  [A-Z]    Any alphabetic character
  $/i      End of string, allow upper or lower case alpha

Upvotes: 1

Elad
Elad

Reputation: 1144

var rgx = /^[A-Za-z]+(-[A-Za-z]+)*$/;

rgx.test("ABC"); // true
rgx.test("ABC-DEF"); // true
rgx.test("AB-CD-EF-GH"); // true
rgx.test("-AB-CD-EF-GH"); // false
rgx.test("AB-CD-"); // false
rgx.test("AB--CD"); // false

Upvotes: 0

vks
vks

Reputation: 67968

^[A-Za-z]+(?:-[A-Za-z]+)*$

This simple regex will do it for you.See demo.

https://regex101.com/r/sJ9gM7/55

var re = /^[A-Za-z]+(?:-[A-Za-z]+)*$/gim;
var str = 'ABC\nABC-DEF\n-ABC\nABC-\nAB-CD-EF-GH\n';
var m;

if ((m = re.exec(str)) !== null) {
if (m.index === re.lastIndex) {
re.lastIndex++;
}
// View your result using the m-variable.
// eg m[0] etc.
}

Upvotes: 1

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626794

You can use .* inside to allow any number of any characters except for a newline:

var regex = /^(?!.*--.*$)[A-Za-z].*[A-Za-z]$/

(?!.*--.*$) will make sure double hyphens are not allowed.

Please check the regex demo here.

function ValIt(str) 
{
   var re = /^(?!.*?--.*?$)[A-Za-z].*[A-Za-z]$/g; 
   if ((m = re.exec(str)) !== null) 
       return true;
     else
       return false;
}

document.getElementById("res").innerHTML = 'RTT--rrtr: ' + ValIt('RTT--rrtr') + "<br>ER#$-wrwr: "+ ValIt('ER#$-wrwr') + "<br>Rfff-ff-d: " + ValIt('Rfff-ff-d');
<div id=res />

Upvotes: 0

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