jquery Regular Expressions

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/^/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/^ (-?/d+) (/./d+)? $/

11. Digital/^/d+ (/.{ 1}/d+)? $/

12. A string consisting of 26 English letters/^[a-za-z]+$/

13. A string consisting of 26 uppercase letters of the English alphabet/^[a-z]+$/

14. A string consisting of 26 letters in lowercase/^[a-z]+$/

15. A string consisting of a number and 26 English letters/^[a-za-z0-9]+$/

16. A string of numbers, 26 English letters, or underscores/^/w+$/

17. Match all characters of single-byte-length character string/^[/x00-/xff]+$/

18. Match all characters of the double-byte length string/^[^/x00-/xff]+$/

19. Does the string contain 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. Regular/[u4e00-u9fa5]/for matching Chinese characters

23. Match double-byte characters (including Chinese characters)/[^x00-xff]/

Application: Calculates the length of a string (a double-byte character length meter 2,ascii character 1)

String.prototype.len=function () {

Return This.replace ([^x00-xff]/g, "AA"). Length;

}

24. Match the regular/n[s| of the blank line] *r/

25. Regular/< (. *) Matching HTML tags >.*</1>|< (. *)/>/

26. Matches the regular/(^s*) of the leading and trailing spaces | (s*$)/

Application: There is no trim function like VBScript in JavaScript, and we can use this expression to do 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 convert IP addresses to corresponding numeric JavaScript programs:

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, directly using the split function to decompose may be simpler, the program is 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 programs that remove duplicate characters from a string

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

/* Use a post-reference to include duplicate characters, then create a second expression with duplicate characters, and take the characters that are not duplicated.

A concatenation of the two. This method may not be applicable for strings that require a character order. */

29. JavaScript program to extract file names from URL addresses using regular expressions

S= "http://www.9499.net/page1.htm";

S=s.replace (/(. */) {0,} ([^.] +). */ig, "$2″);

alert (s); The result is Page1

30. Restrict Form text box entry

You can only enter Chinese:

Onkeyup= "Value=value.replace (/[^u4e00-u9fa5]/g,") "

Onbeforepaste= "Clipboarddata.setdata (' text ',

Clipboarddata.getdata (' text '). Replace (/[^u4e00-u9fa5]/g, "))"

Only full-width characters can be entered:

Onkeyup= "Value=value.replace (/[^uff00-uffff]/g,") "

Onbeforepaste= "Clipboarddata.setdata (' text ',

Clipboarddata.getdata (' text '). Replace (/[^uff00-uffff]/g, "))"

Only numbers can be entered:

Onkeyup= "Value=value.replace (/[^d]/g,") "

Onbeforepaste= "Clipboarddata.setdata (' text ',

Clipboarddata.getdata (' text '). Replace (/[^d]/g, "))"

Only numbers and English can be entered:

Onkeyup= "Value=value.replace (/[w]/g,") "

Onbeforepaste= "Clipboarddata.setdata (' text ',

Clipboarddata.getdata (' text '). Replace (/[^d]/g, "))"

31. Verify that the file name consists of letters, numbers, and/^ (/w+) (/.{ 1}) (/w+)) $/

32. Match date (1900-1999)

/^19/d{2}-((0[1-9)) | ( 1[0-2])-((0[1-9)) | ( [1-2] [0-9]) | (3 ([0|1]))) $/

33. Match Date (2000-2999)

/^20/d{2}-((0[1-9)) | ( 1[0-2])-((0[1-9)) | ( [1-2] [0-9]) | (3 ([0|1]))) $/

34. Match Date Time

/^ (1|2/d{3}-(0[1-9]) | ( 1[0-2])-((0[1-9)) | ( [1-2] [0-9]) | (3 ([0|1]))) ((/d{2}):(/d{2}):(/d{2})? $/

jquery Regular Expressions