I want to check a string is matched so I will do some business logics with it.

The pattern is very simple.

If it matches 100% text but different number so it's a match.

Example:

Pattern: "xxx is a large number" which xxx must be a integer number (not null, not empty, not text, not double number)

1. "123 is a large number" => match
2. "444444 is a large number" => match
3. "is a large number" => not match
4. "123 is not a large number" => not match
5. "Test is a large number" => not match

My code:

var pattern = "^[0-9] $ is a large number";
var testText = "123 is a large number";
var match = Regex.Match(testText, pattern, RegexOptions.IgnoreCase);
if (match.Success)
{
    //do some business logics
}

This is the Regex I try but doesn't work:

"^[0-9] $ is a large number"

Thank you.

CodePudding user response：

^(\d) is a large number$

• ^ for the start of the string

• \d for a digit, 1 or more times

• is a large number$ for the rest of the string (and $ to signify the end)