Uses of exec, test, match, search, replace, split in js

exec: Perform regular processing of string and return the matching result.array[0] is the original string, and array[i] is the position of the match in the entire searched string.
test: Test whether string contains matching results, returns true if included, and does not include return false if included.
match(pattern): perform regular matching based on pattern. If it matches, the matching result will be returned. If the match fails, return null
search(pattern): perform regular matching based on pattern. If a result is matched, it returns its index number; otherwise -1 is returned
replace(pattern,replacement): perform regular matching based on pattern, replace the matching result with replacement
split(pattern): perform regular segmentation based on pattern, returning a divided array
Example:

Copy the codeThe code is as follows:

 
function checkForm() { 
var u = document.form_name.; 
var s = /^[-a-zA-Z0-9_]+(\.[-a-zA-Z0-9_]+)*@[-a-zA-Z0-9_]+(\.[-a-zA-Z0-9_]+)*$/; 
var a = (u); 
var a = (u); 
var a = (s); 
var a = (s); 
alert(a); 
} 

replace

The simplest ability is to calculate it is simple character replacement. The sample code is as follows:

Copy the codeThe code is as follows:

 
var u = "javascript is a good script language"; 
// Here I want to replace the letter a with the letter A
var s = /a/g; 
var a = (s,"A"); 
</script> 

split

Copy the codeThe code is as follows:

 
<script type="text/javascript"> 
var str="How are you doing today?" 
((" ") + "<br />") 
(("") + "<br />") 
((" ",3)) 
</script> 

The output result is:
How,are,you,doing,today?
H,o,w, ,a,r,e, ,y,o,u, ,d,o,i,n,g, ,t,o,d,a,y,?
How,are,you