How to check if string contains at least one alphabetical letter (a-z,A-Z) C#

Question

could someone telle me please how to check if a string contains at least one alphabetical letter? I tryed:

if (StringName.Text.Contains(Char.IsLetter()))
{
 //Do Something
}

But it doesn't work.

score 5 · Accepted Answer · answered Oct 04 '17 at 15:09

5

You can use LINQ:

if (StringName.Text.Any(Char.IsLetter))
{
    // Do something
}

answered Oct 04 '17 at 15:09

itsme86

3

Very strange that no one come up with anything close to this answer before you... Maybe [another universe](https://stackoverflow.com/a/12884682/477420)... – Alexei Levenkov Oct 04 '17 at 15:17

Dmitry Bychenko · Answer 2 · 2017-10-04T15:24:11.860

Try Linq. If you accept any Unicode letter, say, Russian ъ:

if (StringName.Text.Any(c => char.IsLetter(c))) 
{
    // Do Something
}

In case you want just a..z as well as A..Z:

if (StringName.Text.Any(c => c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z')) 
{
    // Do Something
}

Finally, if you insist on regular expressions:

if (Regex.IsMatch(StringName.Text, @"\p{L}")) 
{
   // Do Something 
}

Or (second option) a..z as well as A..Z letters only

if (Regex.IsMatch(StringName.Text, @"[a-zA-Z]")) 
{
   // Do Something 
}

2 Answers2