quantifiers used to create patterns that match a variable number of characters at a certain position in the string : Regular Expression « Validation « ASP.NET Tutorial






  1. ASP.NET Tutorial
  2. Validation
  3. Regular Expression
?:       Zero or one times
*:       Zero or more times
+:       One or more times
{n}:     Exactly n times
{n,}:    At least n times
{n,m}:   At least n times but no more than m times








8.9.Regular Expression
8.9.1.The predefined character classes
8.9.2.quantifiers used to create patterns that match a variable number of characters at a certain position in the string
8.9.3.Metacharacters for Matching Single Characters
8.9.4.Metacharacters for Matching Types of Characters
8.9.5.Quantifiers
8.9.6.Commonly Used Regular Expressions
8.9.7.RegularExpressionValidator compares value against a regular expression
8.9.8.Regular Expression based validation (C#)
8.9.9.Use asp:RegularExpressionValidator to check the zip code
8.9.10.Use asp:RegularExpressionValidator to check the email address
8.9.11.Use Regular expression to validate a Phone number