Regular Expressions

^(?=.*?\d)(?=.*?\D)\w{2,}$

• You're matching the entire string - ^ and $
• The string must consist of at least two alpha-numeric characters - \w{2,}
• The string must contain any number of characters followed by a digit - (?=.*?\d)
• The string must contain any number of characters followed by a character that is not a digit - (?=.*?\D)

^\d{4}[- /.](0?[1-9]|1[0-2])[- /.](0?[1-9]|[12][1-9]|3[01])$

<em style="color:red"> <b>ProgramFOX</b></em>

Sentenryu wrote:

thanks for the reply

Sentenryu wrote:

dd/MM/yyyy

^(0?[1-9]|[12][1-9]|3[01])[- /.](0?[1-9]|1[0-2])[- /.]\d{4}$

<em style="color:red"> <b>ProgramFOX</b></em>

msoutopico wrote:

Expresso is also a really superb tool.
 

Peter_in_2780 wrote:

There are many cases where regex is not the appropriate tool.

[beginning of string][whitespace] OR [whitespace](two or more) OR [whitespace][end of string]

Quote:

[beginning of string][whitespace] OR [whitespace](two or more) OR [whitespace][end of string]

^\s OR \s{2,} OR \s$

if ($str =~ /^\s/ || $str =~ /\s{2,}/ || $str =~ /\s$/) {
    print "String '$str' contains invalid white space sequence(s).";
}

string s1 = @"c:\temp\lev1\lev2\lev3\MYWORD\lev5\lev6";
string mtch = "MYWORD";

string pattern = "^.*(?=" + Regex.Escape(mtch) + ")";
// == "^.*(?=MYWORD)"

Console.WriteLine(Regex.Match(s1, pattern).Value);

string k = Regex.Match(s1, @"\(""(\w+)""\)").Groups[1].Value;

int count = s1.Count(c => c == '(');