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This article mainly introduces the ASP.NET Validation verification control regular expression special symbol example analysis, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.

RegularExpressionValidator control expression description:

Square brackets "[]" use and define acceptable characters. [abc123] indicates that the control can only accept six characters: a, b, c, c, 1, 2, and 3

The anti-collection symbol "^" is used to define unacceptable characters. [^ amurh] means that the control can accept all characters except a to h.

Curly braces "{}" define the number of characters that must be entered. {6} means that only 6 characters can be entered; {6,} means that more than 6 characters must be entered, with no upper limit; {2} 6} means that 2 to 6 characters must be entered; but curly braces must be placed after square brackets, for example, [amurz] {4} indicates that any character between 4 digits an and z must be entered.

Dots are used to represent any character. For example, {3pr 6} means to accept 3 to 6 arbitrary characters.

The logical symbol used by the vertical bar "|" to indicate "or". For example, [1-9] {3 A-Za-z 6} | [3] {3} means you can accept 3 to 6 numbers or 3 letters. (you can tell the difference between case and case.)

Parentheses "()" are used for partitioning, similar to parentheses in numeric operations.

Slash "\" if you want acceptable characters to contain the above special characters. For example,\ ([0-9] {3}\) indicates a phone area code entered in the format "(xxx)".

Code demonstration:

Validation validation control

Enter a name:

Enter date:

Enter a numeric value (integer):

Enter a number (1-10):

Please enter a number less than 50:

Enter a random email:

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