Regular Expression for characters but number and space optional using asp.net web forms [duplicate]

Question

Regular Expression for characters but number and space optional using asp.net web forms.

These are acceptable strings:

 Mazhar
 mazhar123
 mazhar khan1

These are not acceptable:

1233444
@@@@@@
Mazhar@kkk

All Special characters should not be acceptable as well.

If you dont know then please dont down vote, my question is not this Learning Regular Expressions. @Biffen — MMK
– MMK, Commented Nov 23, 2016 at 5:54
Not necessarily. That question has two important things that this one is lacking: An attempt at a solution and an actual question. — Biffen
– Biffen, Commented Nov 23, 2016 at 5:58
Show me the question like my requirement then place as duplicate, I dont know you are senior in this stack over flow. @Biffen — MMK
– MMK, Commented Nov 23, 2016 at 5:59
Do you accept leading spaces, e.g. " abc 123"? trailing spaces, e.g. "abc 123 "? double spaces e.g. "abc 123"? Shall the valid string start with character, e.g is "123abc" accepted? — Dmitrii Bychenko
– Dmitrii Bychenko, Commented Nov 23, 2016 at 6:52

Dmitrii Bychenko · Accepted Answer · 2016-11-23 07:21:17Z

1

Your question is vague one. There're some issues which are still open:

Do you accept leading spaces e.g. " Mazhar"?
Do you accept trailing spaces e.g. "Mazhar "?
Do you accept double spaces e.g. "Mazhar 123"?
Can a valid string start with digit? e.g. "123 Mazhar"

In case answers are No, No, Yes, No you can put it like this

  // The pattern, you probably are looking for:
  string pattern = @"^[A-Za-z]+([A-Za-z0-9 ]*[A-Za-z0-9])*$";

  string[] tests = new string[] {
    // your test cases (valid strings)
    "Mazhar", "mazhar123", "mazhar khan1",
    // your test cases (invalid strings)
    "1233444", "@@@@@@",  "Mazhar@kkk",
    // my test cases (leading space, trailing space, double space, starts with digit)
    " Mazhar", "Mazhar ", "Mazhar    123", "123Mazhar"
  };

  var report = tests
    .Select(item => Regex.IsMatch(item, pattern)
      ? $"{item,15} is valid"
      : $"{item,15} is NOT valid");

  Console.Write(string.Join(Environment.NewLine, report));

The outcome is

         Mazhar is valid
      mazhar123 is valid
   mazhar khan1 is valid
        1233444 is NOT valid
         @@@@@@ is NOT valid
     Mazhar@kkk is NOT valid
         Mazhar is NOT valid  // leading spaces
        Mazhar  is NOT valid  // trailing spaces
  Mazhar    123 is valid      // we accept double spaces
      123Mazhar is NOT valid  // starts with digit

edited Nov 23, 2016 at 7:21

answered Nov 23, 2016 at 7:06

Dmitrii Bychenko

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2 Comments

MMK Over a year ago

Thank you very much will check and update answer. @Dmitry Bychenko

MMK Over a year ago

You are father of regular expression thank you very much. @Dmitry Bychenko

Ashish · Accepted Answer · 2016-11-23 06:41:21Z

0

You can use this regular expression: ^(?![0-9]*$)[a-zA-Z0-9\s]+$

I would recommend you to try for a solution yourself and refer to the question suggested by Biffen.

answered Nov 23, 2016 at 6:41

Ashish

116 bronze badges

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