Commonly used in JavaScript regular expressions to verify

Posted on 2009-07-01 filed under: AJAX (RSS) 350 views   

The correct format: "01" "09" and "1" "31."

Chinese characters matching the regular expression: [u4e00-u9fa5]
Matching double-byte characters (including Chinese characters included): [^ x00-xff]
Blank lines matching the regular expression: n [s |] * r
HTML tags matching the regular expression: / <(.*)>.*|< (.*) /> /
Both spaces matching the regular expression: (^ s *) | (s * $)
Email addresses match the regular expression: w +([-+.] w +) * @ w +([-.] w +) *. w +([-.] w +) *
Website URL matching the regular expression: http:// ([w-]+.)+[ w-]+(/[ w-./?%&=]*)?

(1) Applications: Calculation of the length of string (a double-byte character length of 2, ASCII character 1)
String.prototype.len = function () (return this.replace ([^ x00-xff] / g, "aa"). Length;)

(2) Application: javascript is not as trim as vbscript function, we can use this expression to achieve
String.prototype.trim = function ()
(
return this.replace (/ (^ s *) | (s * $) / g, "");
)
(3) Application: the use of regular expression IP addresses decomposition and conversion
function IP2V (ip) / / IP address into a corresponding numerical
(
re = / (d +). (d +). (d +). (d +) / g / / match the IP address regular expression
if (re.test (ip))
(
return RegExp. $ 1 * Math.pow (255,3)) + RegExp. $ 2 * Math.pow (255,2)) + RegExp. $ 3 * 255 + RegExp. $ 4 * 1
)
else
(
throw new Error ( "Not a valid IP address!")
)
)
(4) Applications: to extract from the URL address of the file name of the javascript program
s = "http://www.9499.net/page1.htm";
s = s.replace (/(.*/){ 0 ,}([^.]+).*/ ig, "$ 2"); / / Page1.htm
(5) Applications: restrictions on the use of regular expressions in the web form input text box
Use regular expressions to limit it only to input Chinese characters: onkeyup = "value =" / blog / value.replace (/["^ u4E00-u9FA5] / g, ")" onbeforepaste = "clipboardData.setData ( 'text', clipboardData . getData ( 'text'). replace (/ [^ u4E00-u9FA5] / g ,"))"
Restrictions on use of regular expressions can only enter the full-width characters are: onkeyup = "value =" / blog / value.replace (/["^ uFF00-uFFFF] / g, ")" onbeforepaste = "clipboardData.setData ( 'text', clipboardData.getData ( 'text'). replace (/ [^ uFF00-uFFFF] / g ,"))"
Restrictions on use of regular expressions can only enter a number: onkeyup = "value =" / blog / value.replace (/["^ d] / g, ")" onbeforepaste = "clipboardData.setData ( 'text', clipboardData.getData ( 'text'). replace (/ [^ d] / g ,"))"
Restrictions on use of regular expressions can only enter numbers and English: onkeyup = "value =" / blog / value.replace (/ [W] / g, "") "onbeforepaste =" clipboardData.setData ( 'text', clipboardData. getData ( 'text'). replace (/ [^ d] / g, "

Tags: quot quot (RSS), prototype (RSS), javascript regular expressions (RSS), regular expression (RSS), url address (RSS), input chinese characters (RSS), decomposition (RSS), double byte characters (RSS), double byte character (RSS), pow (RSS), input text (RSS), conversion function (RSS), len function (RSS), valid ip address (RSS), ascii character (RSS), javascript program (RSS), character length (RSS), application javascript (RSS), blank lines (RSS), ig (RSS)

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