不带数字的正则表达式C＃文本

Question

Please give me advice. How to write a regular expression, which allows only letter (without special character or number]? Valid inputs are for example:

• oil, wheat, grain

not allowed for example:

• 1oil, wheat5, grain33

I try to write regular expression this way, but without success:

    public bool RegexControlProduct()
    {
        Regex regexObj = new Regex("[a-z]+");
        bool foundmatch = regexObj.IsMatch(subjectstring);
        return foundmatch;
    }

Thanks for your help.

Answer 1

If you want to allow anything except numbers, you should do:

^[^\\d]+$

however, if you want to match the string in the format shown in your question, you can do:

^[a-zA-Z,\\s]+$

Demo: http://regex101.com/r/iE2dJ9

Answer 2

You are almost there, just use anchor with your regex.

Regex regexObj = new Regex("^[a-z]+$");
                            ^      ^

You may try to use [a-zA-Z]+ to handle both cases of letters.