Test, validate and match regular expressions
Matches valid Bangladeshi mobile phone numbers. The pattern requires the number to start with '01', followed by a digit from 3 to 9 (covering operator prefixes like 3, 4, 5, 6, 7, 8, 9), and then exactly 8 more digits, making a total of 11 digits. This regex is useful for validating Bangladeshi mobile numbers in forms, user inputs, or data processing systems.