Regular Expression Regex

Question

I want to make patterns that way:

[a-z]+[acentos] || [a-z]+[acentos]+[espaço]+[a-z]+[acentos] || [a-z]+[acentos]+[-]+[a-z]+[acentos]

In order to be able to register a word, it is necessary to be within one of these standards.

For example:

téstê || téstê téstê || téstê-téstê

I did so:

palavra = TextBox1.Text;
Regex regex;
string padrao = @"[^A-Za-záàâãéêíîóõôúûçÁÀÂÃÉÈÍÓÔÕÚÇ']";
regex = new Regex(padrao);
string palavra2 = regex.Replace(palavra, "");
if (palavra == palavra2)
{
    Label1.Text = "Ok!";
}
else {
    padrao = @"[^A-Za-záàâãéêíîóõôúûçÁÀÂÃÉÈÍÓÔÕÚÇ'] [^A-Za-záàâãéêíîóõôúûçÁÀÂÃÉÈÍÓÔÕÚÇ']";

    regex = new Regex(padrao);
    palavra2 = regex.Replace(palavra, "");
    if (palavra == palavra2)
    {
        Label1.Text = "Ok!";
    }
}

The first pattern worked because everything that is not letter or letter with accent is replaced by empty. I store this exchange in a new string and compare it to the previous one, if they are the same, the word followed the pattern. If the first string had a number for example, the new string (which is the default) would be without the number, so the word did not follow the pattern.

The problem is in the other patterns. I took the test and this:

 @"[^A-Za-záàâãéêíîóõôúûçÁÀÂÃÉÈÍÓÔÕÚÇ'] [^A-Za-záàâãéêíîóõôúûçÁÀÂÃÉÈÍÓÔÕÚÇ']";

You are agreeing to start with space. But you should change the space that is in the beginning to void. Space should only be allowed in the middle. I don’t know how to use these expressions. I believe someone who knows, will be able to tell me how to leave my expression.

Answer 1

Try using this regular expression:

[A-Za-zÀ-ú]+ ?\-?[A-Za-zÀ-ú]+

Explanation of what I put the most:

• + determines that what comes immediately before it shall appear 1 or more
• ? optional
• ' '? non-compulsory space
• \-? hyphen

See working on Online Regex.