REGEXP is the abbreviation for regular expressions.
Defining the REGEXP regular expression
The RegExp object is used to store the retrieval mode.
Define the RegExp object with the New keyword. The following code defines the RegExp object named P, whose pattern is "e":
var p=new RegExp ("E"); When you use the RegExp object to retrieve in a string, the character "e" is searched.
Use symbols to describe writing rules:/middle Write regular expression/ ^ match beginning /^ve/with ve beginning with $ match end /ve$/with ve end of \d an arbitrary number \w An arbitrary number or letter \s any string {n} to repeat the left expression n times {m,n} repeat the expression on the left at least m times, up to n times {m,} The expression on the left is repeated at least m times, at most not limited to the left side of the expression, at least one occurrence, at most, the equivalent of {1,} * The expression on the left, at least 0 times, at most, the equivalent of {0,} ? The expression on the left, at least 0 times, At most 1 times, the equivalent of {0,1} [A,b,c] can only take one of the contents of the square brackets [A-z] or [1-9] in the scope of the first | delegate or () priority
var p=new RegExp ("E"); The regular expression is written in the quotation marks in parentheses behind.Methods for REGEXP objects_________________________________________________ I'm gorgeous split-line _____________________________________________________
The RegExp object has 3 methods: Test (), exec (), and compile ().
Test ()
The test () method retrieves the specified value in the string. The return value is true or false.
See if there is a wood-like string, there is no true false.
The quotation marks do not contain "E" return False
Contains e reverse return True
exec ()The EXEC () method retrieves the specified value in the string. The return value is the value that was found. If no match is found, NULL is returned.
See if there is a wood-like string, there is a return rule, no return null
Let him find E.
Let him go find W, no. Return null is not found
compile ()
The compile () method is used to change the REGEXP.
Compile () can either change the retrieval mode or add or remove the second parameter.
Because there is "E" in the string, there is no "D". Back to TrueFalse
_________________________________________________ I'm gorgeous split-line _____________________________________________________
Regular expression to determine whether it is a social security number
<body><script>function func () {varCeshi=NewREGEXP (/^[0-9]{17}[0-9| x]$/); varGuo=document.getelementbyid ("a"). Value; if(Ceshi.test (Guo)) {alert ("correct"); } Else{alert ("Error"); }}</script>Please enter your ID number<input id="a"Type="text"/><input name="SA"Type="Submit"onclick="func ()"Value="Submit"/></body>
Determine if it is a mailbox
<script>function You () { varyouxiang=NewREGEXP ("([a-z0-9_\.-]+) @ ([\da-z\.-]+) \. ([A-z\.] {2,6})");varGuo=document.getelementbyid (" You"). Value; if(Youxiang.test (Guo)) {alert ("correct"); } Else{alert ("Error"); }}</script>Please enter your email<input id=" You"Type="text"/><input name="SA"Type="Submit"onclick="You ()"Value="Submit"/>
JavaScript (c) Regular expressions and the functions implemented
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