Regex validations in asp.net

Question

I want that it should start with alphabet and it's up to user if he/she wants to add numerical but there should be no special characters and should start with alphabet.

I tried "^[A-Za-z][0-9]+$" but it's not working..

Correct format:

  ASDFG123 
  asdfg123 
  a1231sadas 

Wrong format:

  asdfg_123 
  Asdfg-31

Avinash Raj · Accepted Answer · 2014-08-30 08:39:11Z

1

You could try the below regex, in which the string must be start with alphabets followed by one or more digits and again followed by zero or more times alphabets or numbers.

^[A-Za-z]+[0-9]+[A-Za-z0-9]*$

DEMO

You could try the below regex if the input may or maynot contain numbers,

^[A-Za-z]+[A-Za-z0-9]*$

DEMO

Pattern Explanation:

^ Asserts that we are at the start.
[A-Za-z]+ Allows one or more times alphabets(both uppercase and lowercase). + means repeat the preceding token one or more times. In our case the preceding token is the character class.
[A-Za-z0-9]* Allows zero or more times alphabets or numbers. * means repeat the preceding token zero or more times.
$ End of the line.

edited Aug 30, 2014 at 8:39

answered Aug 30, 2014 at 8:22

Avinash Raj

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1 Comment

User072912 Over a year ago

The numeric is optional. The user can input without or with numeric in the middle of the string but there should be no special characters and it should start with alphabet

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