Use Regular Expressions

The following describes the verification functions and expressions used to verify the control using regularexpressionvalidator:

Only numbers can be entered: "^ [0-9] * $"
Only n digits can be entered: "^ d {n} $" matches n digits "/d {n }".
You can only enter at least N digits: "^ d {n,} $"
Only M-N digits can be entered: "^ d {m, n} $"
Only numbers starting with zero and non-zero can be entered: "^ (0 | [1-9] [0-9] *) $"
Only positive numbers with two decimal places can be entered: "^ [0-9] + (. [0-9] {2 })? $"
You can only enter a positive number with 1-3 decimal places: "^ [0-9] + (. [0-9] {1, 3 })? $"
Only a non-zero positive integer can be entered: "^ +? [1-9] [0-9] * $"
Only a non-zero negative integer can be entered: "^-[1-9] [0-9] * $"
Only 3 characters can be entered: "^. {3} $"
You can only enter a string consisting of 26 English letters: "^ [A-Za-Z] + $"
Only a string consisting of 26 uppercase letters can be entered: '^ [A-Z] + $"
You can only enter a string consisting of 26 lower-case English letters: "^ [A-Z] + $"
You can only enter a string consisting of a number and 26 English letters: '^ [A-Za-z0-9] + $"
Only a string consisting of digits, 26 English letters, or underscores can be entered: "^ W + $"
Verify User Password: "^ [A-Za-Z] W {5, 17} $" is in the correct format: it must start with a letter and be between 6 and 18 characters in length,
Verification password: starts with a letter, at least 6 [a-zA-Z0-9] {5, 17}

It can only contain characters, numbers, and underscores.
Check whether ^ % & ',; =? $ "And other characters:" [^ % & ',; =? $ X22] +"
Only Chinese characters can be entered: "^ [u4e00-u9fa5], {0,} $"
Verify email address: "^ W + [-+.] W +) * @ w + ([-.] W + )*. W + ([-.] W +) * $"
Verify interneturl: "^ http: // ([w-] +.) + [w-] + (/[w -./? % & =] *)? $"
Verification phone number: "^ (d {3, 4}) | D {3, 4 }-)? D {7, 8} $"

Correct format: XXXX-XXXXXXX, XXXX-XXXXXXXX, XXX-XXXXXXX ",

XXX-XXXXXXXX, xxxxxxx, XXXXXXXX ".
Verify the ID card number (15 or 18 digits): "^ d {15} | D {} 18 $"
12 months of verification: "^ (0? [1-9] | 1 [0-2]) $ "the correct format is:" 01 "-" 09 "and" 1 "" 12"
31 days of verification for a month: "^ (0? [1-9]) | (1 | 2) [0-9]) | 30 | 31) $"

The correct format is "01", "09", and "1", "31 ".

Regular Expression matching Chinese characters: [u4e00-u9fa5]
Match double byte characters (including Chinese characters): [^ x00-xff]
Regular Expression for matching empty rows: N [S |] * R
Regular Expressions matching HTML tags:/<(. *)>. * | <(. *)/>/
Regular Expression matching the first and last spaces: (^ s *) | (S * $)
Regular Expression matching the email address: W + ([-+.] W +) * @ w + ([-.] W + )*. W + ([-.] W + )*
The regular expression matching the URL:Http: // ([w-] +.) + [w-] + (/[W-./? % & =] *)?

(1) Application: Calculate the length of a string (two-byte length Meter 2, ASCII character meter 1)
String. Prototype. Len = function () {return this. Replace ([^ x00-xff]/g, "AA"). length ;}

(2) Application: JavaScript does not have trim functions like VBScript, so we can use this expression to implement
String. Prototype. Trim = function ()
{
Return this. Replace (/(^ s *) | (S * $)/g, "");
}
(3) Application: use regular expressions to break down and convert IP addresses
Function ip2v (IP) // convert the IP address to the corresponding value
{
Re =/(D +). (D +)/g // Regular Expression matching IP addresses
If (Re. Test (IP ))
{
Return Regexp. $1 * Math. Pow (255) + Regexp. $2 * Math. Pow () + Regexp. $3 * + Regexp. $4*1
}
Else
{
Throw new error ("not a valid IP address !")
}
}
(4) Application: javascript programs that extract file names from URLs
S = "http://www.9499.net/page1.htm ";
S = S. Replace (/(. */) {0,} ([^.] +). */ig, "$2"); // page1.htm
(5) Application: use regular expressions to restrict text box input in a webpage form
You can only enter Chinese characters using regular expressions: onkeyup = "value ="/blog/value. replace (/["^ u4E00-u9FA5]/g,") "onbeforepaste =" clipboardData. setdata ('text', clipboardData. getdata ('text '). replace (/[^ u4E00-u9FA5]/g ,"))"
Use regular expressions to limit that only the full-width characters can be entered: onkeyup = "value ="/blog/value. replace (/["^ uFF00-uFFFF]/g,") "onbeforepaste =" clipboardData. setdata ('text', clipboardData. getdata ('text '). replace (/[^ uFF00-uFFFF]/g ,"))"
Use a regular expression to limit that only numbers can be entered: onkeyup = "value ="/blog/value. replace (/["^ d]/g,") "onbeforepaste =" clipboardData. setdata ('text', clipboardData. getdata ('text '). replace (/[^ d]/g ,"))"
You can only enter numbers and English letters using regular expressions: onkeyup = "value ="/blog/value. replace (/[w]/g, ")" onbeforepaste = "clipboardData. setdata ('text', clipboardData. getdata ('text '). replace (/[^ d]/g ,"

 

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