regex in c#

Question

what does numericregex = @"^[0-9]{5} means? because i want to set minimum 4 maximum 18

Muhammad Imran Ansari · Answer

In C#, you can use the following regular expression (regex) pattern to enforce a minimum length of 4 and a maximum length of 18: string pattern = @"^.{4,18}$";

Jignesh Kumar · Answer

Hi Nasir, Please check below one, using System; using System.Text.RegularExpressions; string input = "123"; // Example less then 4 string regexPattern = @"^\d{4,18}$"; bool isMatch = Regex.IsMatch(input, regexPattern); Console.WriteLine(isMatch); // Output is false using System; using System.Text.RegularExpressions; string input = "123234234"; // Example between 4 to 18 string regexPattern = @"^\d{4,18}$"; bool isMatch = Regex.IsMatch(input, regexPattern); Console.WriteLine(isMatch); // Output is true

Anandu G Nath · Answer

@Basit Nisar You can use the below code numericregex = @"^[0-9]{4,18}"

Mohit Kala · Answer

string regexPattern= @"^\d{4,18}$"; it will allow min 4 digit and max 18 digits

Janarthanan S · Answer

To modify the regular expression to match a minimum of 4 and a maximum of 18 digits, you can update it as follows: numericregex = @"^[0-9]{4,18}" The modification involves using a quantifier {4,18} after the character class [0-9] . This quantifier specifies that the preceding character class (digit) should occur at least 4 times and at most 18 times.

Amit Mohanty · Answer

The expression @"^[0-9]{5}" is a regular expression pattern that matches a string consisting of exactly five numeric digits (0-9) at the beginning of the string. To enforce the minimum number of 4 and maximum number of 18 in C#, you can utilize the following pattern: string numericRegex = @"^(?:[4-9]|1[0-8])$";

Subarta Ray · Answer

The provided regular expression ^[0-9]{5} is designed to match a string that: ^ asserts the start of the string. [0-9] matches any digit from 0 to 9. {5} specifies that there should be exactly five digits. So, ^[0-9]{5} matches a string that starts with exactly five digits. If you want to modify this regex to set a minimum of 4 and a maximum of 18 digits, you can use the following pattern: string numericRegex = @"^[0-9]{4,18}";