javascript regular expression tutorial

Javascript Regular var re = new RegExp (pattern, flag); replace each group with a specific value for the second, or use the RegExp function. replace (//, fn); verify whether RegExp is true. test (); used to test true false RegExp.exe c (); the array returned by the Group first returns a total group and then returns each group alert(re.exe c (o) [1]); 0: returns the total set. 1: returns the First Matching.

A JavaScript Regular Expressions1.EXEC retrieves the value specified in the string, returns the found value, and determines its location2.test retrieves the value specified in the string, returning True or false3. Creation of regular expression objects:(1) Mode one:Var rgex=new RegExp ("[0-9]", "mode");(2) Way two: sim

RegExp Object MethodsEXEC (): the same as the match () method of the String object . The parameter is the searched string. Returns an array or null. Test (): The same as the search () method of the String object . The parameter is the searched string. Returns true or false. RegExp Object Instance PropertiesGlobal: Boolean value that indicates whether the suffix option g in the regular expression is set.

JavaScript Regular Expressions support packet capture, and the results of grouping are stored in the static property $1-$9 of RegExp. That is, when the number of groups in a regular expression exceeds 9, the regexp retains a maximum of 9.Regular Var with 10 groupings RegExp

JavaScript defines a regular expression in two ways:1. Create a RegExp object from the RegExp () constructor to define the regular expression .2. direct definition of regular expression

This article introduces common usage of JS regular expressions, involving knowledge about the usage of js regular expressions. If you are interested, learn it together and get on the right track, to learn about the usage of js regular expressions, please refer to this tutorial. Definition and use var patt1 = new RegE

JavaScript-Common regular expression totals /** * Inspection of various rules * @param str Test content * @param cType default inspection rule string [* empty, check for empty * telphone, block Machine cell phone number * Allphone, all mobile phone number * Ydphone, mobile phone number * Ltphone, Unicom mobile phone number * DXPH One, mobile phone number

(classname ); } Then there is a problem. You can try it and I don't want to post my HTML and CSS. The problem is that the elements you want to query use contains to test whether the specified class selector is false, whether or not the element is contained. Why? It was planted here last night.Debug I put my goal on a regular expression. I was wondering if my

Learn JavaScript regular Good Article one: http://www.cainiao8.com/web/js_note/js_regular_expression.html Test : Tests whether a string contains a matching result, contains return true, and does not contain return false. Match : A regular match based on pattern and, if matched to, returns a matching result, such as a match that does not return a n

In javascript, the regular expression is used to delete leading and trailing spaces. Remove leading space Copy codeThe Code is as follows:Str = str. replace (/^ \ s + | \ s + $/g ,''); The js Regular Expression deletes spaces before and after a string. String.prototype.trim=

Regular expression is regular expression, it seems that English is better than Chinese understand more, is to check expression characters Not meet the rules!! Regular expressions have a very powerful and very complex object regexp

VBS Tutorial: regular expression syntax Regular expression syntax A regular expression is a text mode consisting of common characters (such as characters a to z) and special characters

is used, "$" will match the end of the absolute string instead of the newline character, which is turned on by default. U Greedy mode, similar to the role of question marks, the maximum match is greedy mode. the common metacharacters Code Description . Match any character except newline (\r\n,\r,\n) \w Match letters or numbers or underscores or kanji \s Matches any

Javascript --- regular expression (1) The regular expression is an object that describes the character pattern. it is used to verify whether the input data of the client complies with the established rules, such as limiting the length or format of input characters. because o

When using regular expressions in JavaScript, a pit is encountered: The first match is true, and the second match is false.Because there is a "LastIndex" property in a regular expression object with the global identity "G", this property is used to specify the starting position of the next match.For example:var New //

Below is a javascript I designedProgramIt is simple, but it brings me great convenience. I have been using it to debug some javascript programs to test regular expression matching. Apart from searching and replacing common strings, you can also use regular expressions to imp

This regular expression collects in the network, but that website even copies all need to register the member, despises it, therefore does not mention him. Also, the original author could not be the site.The HTML tag has In fact, the regular expression matching HTML tags is very short, as follows:That's it, it's gone?

automatic conversion of JavaScript ). We use search instead of match:Copy codeThe Code is as follows: var hasclass = function (Ele, CLS ){Return ELE. classname. Search (New Regexp ('(\ s | ^)' + CLS + '(\ s | $)')>-1 );} I'm satisfied with the implementation of prototype. js. the test method is the most lightweight in all regular expressions (on the contrary, exec is the heaviest, slowest, and most powerf

If you want to read and understand it, you can read it a bit. If you only need the results, skip to the end of this article.There was a need to match the decimal type with a JavaScript regular expression, and then the previous writing was not fully recognized.Later on the internet to find a lot, even some foreigners, including some of the Pure English Forum, foun

This article mainly introduces how to control the input box of JavaScript to only input Chinese characters, numbers, and English characters. The character input restriction function is implemented based on regular expression verification, which has some reference value, for more information about how to enter Chinese, numbers, and English characters in the # wiki