JavaScript Regular Expression knowledge

JavaScript Regular Expression knowledge

Js Regular Expression knowledge Summary

 

Regular Expression:

1. What is RegExp? RegExp is the abbreviation of a regular expression. The RegExp object is used to specify the content to be retrieved in the text.

2. Define RegExp: var + variable name = new RegExp ();

3. The RegExp object has three methods:

1) test () retrieves the specified value in the string. The returned value is true or false.

var p1=new Reg(e);document.write(Reg.test(welcome to China!));

2) exec ()

var p1=new Reg(e);document.write(Reg.exec(welcome to China!));

3) compile ()

var p1=new Reg(e);document.write(Reg.compile(welcome to China!));

4. Modifier

1) I perform case-insensitive matching.

2) g performs global matching

3) m executes multi-row matching.

5. square brackets (used to find characters in a certain range)

1) [abc] searches for any character between square brackets

2) [^ abc] searches for any characters not in square brackets

3) [0-9] search for any number between 0-9.

4) [a-z] searches for characters between any lowercase letters a-z.

5) [A-Z] Find characters between any capital A-Z

6) [A-z] searches for characters between any uppercase letters, lowercase letters, and lowercase letters.

7) [adgk] searches for any character in a given set

8) [^ adgk] searches for any character outside the given set

9) (red | biue | green) find any given options

6. metacharacters

1) w: Find word characters

2) W: find non-word characters

3) d: Search for numbers

4) D: Search for non-numeric characters

7. quantifiers

N + matches any string containing at least one n.

N * matches any string containing zero or more n.

N? Match any string containing zero or one n.

N {X} matches the string that contains X n sequences.

N {X, Y} matches the string that contains X or Y n sequences.

N {X,} matches strings that contain at least X n sequences.

N $ matches any string ending with n.

^ N matches any string starting with n.

? = N matches any string followed by the specified string n.

?! N matches any string that is not followed by the specified string n.

Exercise Question 1: Check whether the format of the ID card is correct

Enter the ID card number:
:


Exercise Question 2: Check whether the entered email format is correct

Enter your email address:

:


Relatively speaking, regular expressions in js are a very important point. Many places need to work with regular expressions, so our friends must learn this content well.

Reference Source:
Js Regular Expression
Http://www.lai18.com/content/351738.html

Additional reading

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