Regular expressions commonly seen in jquery

quickexpr =/^ (?: [^<]* (<[ww]+>) [^>]*$|# ([w-]+) $)/
(?:...) Represents a non-capture type

[^<] indicates that it starts with "<" and contains 0 or more ' < ' brackets

(<[ww]+>) is a catch type that starts with ' <> ' and contains one or more characters in the middle

$ indicates the end of a character

(# ([w-]+)) means a catch type, with ' # ' numbers and strings, numbers, _, and-

Rnotwhite =/s/
s represents a symbol other than a blank character

Trimleft =/^s+/trimright =/s+$/
The left and right edges of the blank. S is a blank character. ^ prefix denotes string start, $ suffix indicates end of string

Rdigit =/d/
Indicates a number

Rsingletag =/^< (w+) s*/?> (?:</1>)? $/
^< (w+) s*/?>
The expression starts with ' < ', contains one to many characters, and 0 to multiple blanks, 0 or one '/' and ' > ' End,

(?:</1>)? $

1. Non-negative integer/^d+$/
2. Positive integer/^[0-9]*[1-9][0-9]*$/
3. Non-positive integer/^ ((-d+) | ( 0+)) $/
4. Negative integer/^-[0-9]*[1-9][0-9]*$/
5. Integer/^-?d+$/
6. Non-negative floating-point number/^d+ (. d+)? $/
7. Positive floating-point number/^ ([0-9]+.[ 0-9]*[1-9][0-9]*) | ([0-9]*[1-9][0-9]*. [0-9]+) | ([0-9]*[1-9][0-9]*)] $/
8. Non-positive floating-point number/^ (-d+ (. d+)?) | (0+ (. 0+)?)) $/
9. Negative floating-point number/^ (-([0-9]+.[ 0-9]*[1-9][0-9]*) | ([0-9]*[1-9][0-9]*. [0-9]+) | ([0-9]*[1-9][0-9]*))] $/
10. Floating-point number/^ (-?d+) (. d+)? $/
11. Digital/^d+ (. { 1}d+)? $/
12. A string/^[a-za-z]+$/consisting of 26 English letters
13. A string consisting of 26 uppercase letters/^[a-z]+$/
14. A string consisting of 26 lowercase letters/^[a-z]+$/
15. A string consisting of numbers and 26 English letters/^[a-za-z0-9]+$/
16. A string of numbers, 26 English letters, or underscores/^w+$/
17. A string that matches all Single-byte characters/^[x00-xff]+$/
18. A string that matches all two-byte-length characters/^[^x00-xff]+$/
19. Whether the string contains double-byte characters/[^x00-xff]+/
20.email address/^[w-]+ (. [ w-]+) *@[w-]+ (. [ w-]+) +$/
or/w+ ([-+.] w+) *@w+ ([-.] w+) *.w+ ([-.] w+) * * *
21.url Address/^[a-za-z]+://(w+ (-w+) *) (. ( w+ (-w+) *)) * (? s*)? $/
or/http://([w-]+.) +[w-]+ (/[w-/?%&=]*)?
22. Matching the regular/[u4e00-u9fa5]/of Chinese characters
23. Matching Double-byte characters (including Chinese characters)/[^x00-xff]/
Application: Computes the length of the string (a double-byte character length meter 2,ascii character 1)
String.prototype.len=function () {
Return This.replace ([^x00-xff]/g, "AA"). Length;
}
24. Matching empty rows of regular/n[s|] *r/
25. Regular/< (. *) >.*</1>|< (. *) Matching HTML tags/>/
26. Matching the right and end spaces of the regular/(^s*) | (s*$)/
Application: There is no trim function like VBScript in the web effects, we can use this expression to implement the following:
String.prototype.trim = function () {
Return This.replace (/(^s*) | ( s*$)/g, "");
}
27. Match the regular/(d+) of the IP address. (d+). (d+). (d+)/
Application: Use regular expressions to match IP addresses and translate IP addresses into JavaScript programs that correspond to numeric values:
function IP2V (IP) {
re=/(d+). (d+). (d+). (d+)/g;
if (Re.test (IP)) {
Return Regexp.$1*math.pow (255,3)) +
Regexp.$2*math.pow (255,2)) +
regexp.$3*255+regexp.$4*1;
}
else{
throw new error ("Not a valid IP address!");
}
}
In fact, it may be simpler to decompose directly with the split function, as follows:
var ip= "10.100.20.168′;
Ip=ip.split (".");
Alert ("IP value is:" + (ip[0]*255*255*255+ip[1]*255*255+ip[2]*255+ip[3]*1));
28. JavaScript program to remove repetitive characters from strings
var s= "Abacabefgeeii";
var s1=s.replace (/(.). *1/g, "$1′);
var re=new regexp ("[" +s1+ "]", "G");
var s2=s.replace (Re, "");
alert (S1+S2); The result is: ABCEFGI