javascript regular expression tutorial

I picked a post titled common JavaScript functions from the Internet two days ago, which contains verification functions that are commonly used on the client, however, all the functions in it use the string Decomposition Method for judgment,ArticleAfter submission, many friends suggested that many functions can be replaced by regular expressions. I will change these functions to

Use Regexp's explicit constructor. Syntax: New Regexp ("pattern" [, "Flags"]). Use Regexp's implicit constructor in plain text format:/pattern/[flags]. The pattern part is required for the regular expression pattern text to be used. In the first method, the pattern part exists as a javascript string and must be enclosed by double quotation marks or single quota

Regular Expression MatchingImplement regular expression matching with support for ‘.‘ and ‘*‘ .‘.‘ Matches any single character. ' * ' Matches zero or more of the preceding element. The matching should cover the entire input string (not partial). The function prototype should be:bool IsMatch (const char *s, const char

There is nothing to do today, the JavaScript to replace the method to explain, if it is wrong or unreasonable is reasonable, because I am not a veteran, nor rookie, I do not know what the bottom of my bird?? Ah ~ ~ The syntax for the Replace method is: Stringobj.replace (rgexp, ReplaceText) stringobj is a string, reexp can be a regular expression object (REGEXP)

Discussion on JavaScript regular expression group matching Syntax Metacharacters (pattern): used for group matching repeatedly Attribute $1 ~ $9 if it exists, it is used to obtain the matched substring in the corresponding group. \ 1 or $1 is used to match the content in the first group. \ 2 or $2 is used to match the content in the first group. ... \ 9 or $9 is

There are two ways to use regular expressions in JavaScript. The first is to build a RegExp object, and the second is to use "//" to define the Perl style. For example: The code is as follows Copy Code var str = ' http://www.111cn.net/';var reg = new RegExp (' http ', ' I ');Alert (Reg.test (str));OrAlert (/http/.test (str)); The above example is to use two ways to det

JavaScript Regular expression UsageDemo: http://www.huiyi8.com/jiaoben/JavaScript effects//hi.baidu.com/jxqlovejava/item/4160b33ab4414d82f4e4ad4b -->JavaScript Regular expression Usage

This article mainly introduces the usage of search () in javascript regular expressions, and analyzes the usage skills of search, for more information about how to use the regular expression search () in javascript, see the example in this article. Share it with you for your

Test: tests Whether a string contains a matching result, contains a return of true, and does not contain a return of false. match: Regular match based on pattern, if matched to, returns match result, such as no match to return null Search : a regular match based on pattern, and returns the number of indexes if it matches a result; 1 Split: Regular segmentation

This article mainly introduces an example of the replace method for JavaScript string objects. The replace method is used for string replacement and supports regular expression replacement. For more information, see JavaScript replace Method The replace method is used to replace some strings with other strings, or rep

my expectations? When I was writing a question, I suddenly thought$replacementChange$01Maybe you can. I did not expect it. Now it is.'$01173' In addition$replacement($1173)The result shown in js is what I expected. That js wants$11Add73What should I do? Try$01173? JS is just a bit more intelligent. It finds that there are no 11 groups in your regular expression, so it will$1173Split$1And173Two parts.

For more information, see the code.Verification result:PortalUse a JavaScript regular expression to verify non-positive integers:Http://www.111cn.net/wy/js-ajax/125202.htmValidate a non-zero positive integer: http://www.111cn.net/wy/js-ajax/125207.htm using a JavaScript regular