Regular expression Instances

1. Verify numbers: Only 1 numeric expressions can be entered ^\d$ description matches an example of a number match 0,1,2,3 mismatch example 2. You can only enter n numeric expressions ^\d{n}$ For example ^\d{8}$ describe matching 8 numbers matching example 12345678,22223 Example of 334,12344321 mismatch 3. You can only enter at least n numeric expressions ^\d{n,}$ For example, ^\d{8,}$ describes an example that matches a minimum of n number matches 12345678,123456789,12344321 a mismatch example 4. Only the number of M to n can be entered The word expression ^\d{m,n}$ For example ^\d{7,8}$ describes an example of matching m to n numbers matching an example of 12345678,1234567 mismatch 123456,1234567895. You can only enter a numeric expression ^[0-9]*$ describe a match to any number Example 12345678,1234567 mismatch example E, clear Moon, Http://blog.csdn.net/21aspnet6. You can only enter an interval numeric expression ^[12-15]$ Describe an example of a number match that matches an interval Example of 12,13,14,15 mismatch 7. Enter only 0 and non-0 numeric expressions ^ (0|[ 1-9][0-9]*) $ description can be 0, the first number cannot be 0, the number can have 0 matching examples 12,10,101,100 mismatch example 01, clear Moon, http://blog.csdn.net/21aspnet8. Only real expressions can be entered ^[ -+]?\d+ (\.\d+)? $ Describes an example that matches a real number match 18,+3.14,-9.90 a mismatch example. 6,33s,67-999. A positive real-number expression ^[0-9]+ (. [) that can only enter N decimal places. 0-9]{n})? $ with ^[0-9]+ (. [ 0-9]{2})? $ For example describes an example of a positive real number matching n decimal digits 2.22 mismatch example 2.222,-2.22,http://blog.csdn.net/21aspnet10. A positive real-number expression ^[0-9]+ (.) that can only enter M-n decimal places. 0-9]{m,n})? $ with ^[0-9]+ (. [ 0-9]{1,2})? $ as an example of an example that describes a positive real number matching m to n decimal places 2.22,2.2 An example of a mismatch 2.222,-2.2222,http://blog.csdn.net/21aspnet11. You can only enter a positive integer that is not 0Number expression ^\+? [1-9] [0-9]*$ Description matches An example of a non-0 positive integer match 2,23,234 example 0,-4,12. You can only enter a negative integer expression that is not 0, ^\-[1-9][0-9]*$ describes an example that matches a negative integer matching non 0 -2,-23,-234 example of a mismatch 0, 4, 13. You can enter only n character expressions ^. {n}$ with ^. {4}$ is an example of a match n characters, note that Chinese characters only count 1 characters to match the example of 1234,12we,123 Qing, qingqing Moon mismatch example 0,123,123WWW,HTTP://BLOG.CSDN.NET/21ASPNET/14. You can only enter English characters An expression ^. [a-za-z]+$, for example, describes matching English characters, case asp,www, case-matching example, 0,123,123WWW,HTTP://BLOG.CSDN.NET/21ASPNET/15. You can only enter uppercase English character expressions ^. [a-z]+$, for example, describes an example of matching English uppercase characters net,www, a mismatch of example 0,123,123www,16. You can only enter lowercase English character expressions ^. [a-z]+$ For example describes an example of matching English uppercase characters asp,csdn mismatch example 0,net,www,17. You can only enter English characters + numeric expressions ^. [a-za-z0-9]+$ as an example of matching English characters + number matching example 1ASP,W1W1W, mismatch example 0,123,123,WWW,HTTP://BLOG.CSDN.NET/21ASPNET/18. Only English characters/numbers/underscores can be entered An example of an expression ^\w+$ an example that matches an English character or a number or underscore match 1asp,www,12,1_w a mismatch of examples 3#,2-4,w#$,http://blog.csdn.net/21aspnet/19. password example expression ^. [a-za-z]\w{m,n}$ Describes an example that matches an m-n-bit character at the beginning of an English character and can only be matched by a numeric letter or underscore 20. Verifying an initial uppercase expression \b[^\wa-z0-9_][^\wa-z0-9_]*\b An example that describes the first letter can only be capitalized Examples of sub-asp,net mismatch http://blog.csdn.net/21aspnet/21. Verify the URL (with id= Chinese) vs.net2005 no this feature expression ^http:\/\/([\w-]+(\. [\w-]+] + (\/[\w-. \/\?%&=\u4e00-\u9fa5]*)?)? $ Description Validation band? Examples of id= in Chinese matches example of Http://blog.csdn.net/21aspnet/,http://blog.csdn.net?id= Qing Moon mismatch 22. Verifying Chinese character expression ^[\u4e00-\u9fa5]{0 ,}$ describes only the example of Chinese character matching to clear the example of HTTP://BLOG.CSDN.NET/21ASPNET/23. Verify that the QQ number expression [0-9]{5,9} describes 5-9-bit QQ number matching example 10000,123456 mismatch example 10000w,http://blog.csdn.net/21aspnet/24. Verifying e-mail (same as verifying MSN number) expression \w+ ([-+. '] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.]     \w+) * Description Note MSN with non-Hotmail.com mailbox can also match example aaa@msn.com mismatch example 111@1. HTTP://BLOG.CSDN.NET/21ASPNET/25. Verifying the identity card number (rough, best server-side tuning Class library fine-grained authentication) expression ^[1-9] ([0-9]{16}|[ 0-9]{13}) [xx0-9]$ describes a matching example 15 or 18-bit ID number that supports an example of a mismatch with X HTTP://BLOG.CSDN.NET/21ASPNET/26. Verify that the phone number (contains 159, does not contain PHS) expression ^13[0-9 ]{1}[0-9]{8}|^15[9]{1}[0-9]{8} Describes an example of a 139XXXXXXXX mismatch that contains a 159 phone number 130-139 match examples 140xxxxxxxx,http://blog.csdn.net/ 21aspnet/27. Verifying the phone number (very complex, VS.) NET2005 given is wrong) expression (imperfect) scheme one ((\ (\d{3}\) |\d{3}-) | ( \ (\d{4}\) |\d{4}-))? (\d{8}|\d{7}) Scenario II (^[0-9]{3,4}\-[0-9]{3,8}$) | (^[0-9]{3,8}$) | (^\ ([0-9]{3,4}\) [0-9]{3,8}$] | (^0{0,1}13[0-9]{9}$) Support cell phone number but not perfect description Shanghai: 02112345678 3+8 bit Shanghai: 021-12345678 Shanghai: (021)-12345678 Shanghai: (021) 12345678 Zhengzhou: 03711234567 4+7-bit hangzhou: 057112345678 4+8-bit and with points Machine number, the situation of the country code because of the situation is very complex so do not recommend the front desk to do 100% verification, so far seems to have no one to write a containing all types, in fact, there are many situations in itself is contradictory. If anyone has a better verification call please leave a message matching example mismatch example 28. Verify Passport expression (P\d{7}) | G\D{8}) Describes examples that verify p+7 numbers and g+8 numbers match the example of a mismatch, http://blog.csdn.net/21aspnet/29. Verify the IP expression ^ (25[0-5]|2[0-4][0-9]|[ 0-1]{1}[0-9]{2}| [1-9] {1} [0-9] {1}| [1-9]) \. (25[0-5]|2[0-4][0-9]| [0-1] {1} [0-9] {2}| [1-9] {1} [0-9] {1}| [1-9]|0] \. (25[0-5]|2[0-4][0-9]| [0-1] {1} [0-9] {2}| [1-9] {1} [0-9] {1}| [1-9]|0] \. (25[0-5]|2[0-4][0-9]| [0-1] {1} [0-9] {2}| [1-9] {1} [0-9] {1}| [0-9]) $ description Verify IP Match example 192.168.0.1 222.234.1.4 mismatch Example 30. Verify the domain expression ^[a-za-z0-9]+ ([a-za-z0-9\-\.] +)? \.s|) $ Description Validation Domain Match example csdn.net baidu.com it.com.cn mismatch Example 192.168.0.1 31. Verify credit Card expression ^ ((?: 4\d{3}) | (? : 5[1-5]\d{2}) | (?: 6011) | (?: 3[68]\d{2}) | (?: 30[012345]\d)) [ -]? (\d{4}) [ -]? (\d{4}) [ -]? (\d{4}|3[4,7]\d{13}) $ Description Verify Visa Card, MasterCard, Discover Card, American Express match example mismatch example 32. Verifying ISBN international ISBN expression ^ (\d[-]*) {9}[\dxx]$ Description Verification ISBN international Standard Example of a quasi-ISBN match 7Example of -111-19947-2 mismatch 33. Verify GUID Global Unique identifier expression ^[a-z0-9]{8}-[a-z0-9]{4}-[a-z0-9]{4}-[a-z0-9]{4}-[a-z0-9]{12}$ description Example of format 8-4-4-4-12 match example of 2064d355-c0b9-41d8-9ef7-9d8b26524751 mismatch 34. Verify the file path and extension expression ^ ([a-za-z]\:|\\) \ \ ([^\\]+\\) *[^\/:* ?" <>  |] +\.txt (L)? $ description Check path and file name extension matching example E:\mo.txt mismatch example E:\, Mo.doc, E:\mo.doc, http://blog.csdn.net/21aspnet/35. Validating HTML color value expressions ^ #? ([a-f]| [a-f]| [0-9]) {3} ([a-f]| [a-f]| [0-9]) {3})? $ description Check Color Match example #FF0000 mismatch example http://blog.csdn.net/21aspnet/^[1-9]\d*\.\d*|0\.\d*[1-9]\d*$ integer or decimal: ^[0-9]+\. {0,1} [0-9] {0,2}$ can only enter a number: "^[0-9]*$". Only n digits can be entered: "^\d{n}$". Only numbers with at least n digits can be entered: "^\d{n,}$". You can enter only the digits of the m~n bit:. "^\d{m,n}$" can only enter numbers starting with 0 and non-0: "^ (0|[ 1-9][0-9]*) $ ". You can only enter a positive real number with two decimal places: "^[0-9]+ (. [ 0-9]{2})? $ ". You can only enter a positive real number with a decimal position: "^[0-9]+ (. [ 0-9]{1,3})? $ ". You can only enter a non-zero positive integer: "^\+?" [1-9] [0-9]*$]. You can only enter a non-zero negative integer: "^\-[1-9][]0-9" *$. Only characters with a length of 3 can be entered: "^. {3}$ ". You can only enter a string consisting of 26 English letters: "^[a-za-z]+$". You can only enter a string consisting of 26 uppercase English letters: "^[a-z]+$". You can only enter a string consisting of 26 lowercase English letters: "^[a-z]+$". You can only enter a string consisting of a number and 26 English letters: "^[a-za-z0-9]+$". You can only enter a string consisting of a number, 26 letters, or underscores: "^\w+$". Verify user password: "^[a-za-z]\w{5,17}$" is in the correct format: start with a letter, length between 6~18, can contain only characters, numbers, and underscores. Verify that it contains ^%& ',; =?$\ ' characters: "[^%& ',; =?$\x22]+". Only Chinese characters can be entered: "^[\u4e00-\u9fa5]{0,}$" Verify email Address: "^\w+ ([-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] \w+) *$ ". Verify InternetURL: "^http://([\w-]+\.) +[\w-]+ (/[\w-./?%&=]*)? $ ". Verify the phone number: "^ (\ (\d{3,4}-) |\d{3.4}-)? \d{7,8}$" The correct format is: "Xxx-xxxxxxx", "xxxx-xxxxxxxx", "xxx-xxxxxxx", "xxx-xxxxxxxx", " XXXXXXX "and" XXXXXXXX ". Verify the Social Security number (15-bit or 18-digit number): "^\d{15}|\d{18}$". Validation 12 months of the year: "^ (0?[ 1-9]|1[0-2]) $ "The correct format is:" 01 "~" 09 "and" 1 "~" 12 ". Verify one months of 31 days: "^ ((0?[ 1-9]) | ((1|2) [0-9]) |30|31) $ "correct format for;" 01 "~" 09 "and" 1 "~" 31 ". Regular expression matching Chinese characters: [\u4e00-\u9fa5] matches double-byte characters (including kanji): [^\x00-\xff] Apply: 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; Regular expression that matches a blank line: \n[\s|] *\r regular expressions that match HTML tags:<(.*)>(.*)<\/(.*)>|<(.*)\/>Regular expression matching the leading and trailing spaces: (^\s*) | (\s*$) Application: JavaScript does not have a trim function like VBScript, which we can do with this expression, as follows: String.prototype.trim = function () {return This.replace (/(^\s*) | ( \s*$)/g, "");} Use regular expressions to decompose and convert IP addresses: The following is a JavaScript program that matches an IP address with a regular expression and translates an IP address into a corresponding value: function IP2V (IP) {re=/(\d+) \. \d+) \. (\d+) \. (\d+)/g//match the regular expression of the IP address 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!")}} However, the above program without regular expression, and directly with the split function decomposition 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)) matches the regular expression of the email address: \w+ ([-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] \w+) * Regular expression matching URL URL:/http ([\w-]+\.) +[\w-]+ (/[\w-./?%&=]*)? Use regular expressions to restrict the entry of text boxes in a Web form: Use regular expressions to restrict input to only Chinese: use regular expressions to restrict input of only full-width characters: limit only numbers with regular expressions: You can only enter numbers and English with regular expressions:<inputonkeyup= "Value=value.replace (/[^\u4e00-\u9fa5\w]/g, ')"Onbeforepaste= "Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text ')." Replace (/[^\u4e00-\u9fa5\w]/g, ")"value= "Allow underline, alphanumeric alphabet and kanji"><Scriptlanguage= "JavaScript">if(document.layers)//Trigger Keyboard Eventsdocument.captureevents (event.keypress)functionXZ (thsv,nob) {if(Nob=="2") {Window.clipboardData.setData ("text","") Alert ("avoid illegal character input, do not copy characters"); returnfalse; } if(Event.keycode!=8&&Event.keycode!= -&&Event.keycode!=Panax Notoginseng&&Event.keycode!= -&&Event.keycode!= the&&Event.keycode!= +) {THSVV=Thsv.value;//the value enteredThsvs=thsvv.substring (Thsvv.length-1);//the last character entered//thsvss=thsvv.substring (0,thsvv.length-1);//Remove the last error characterif (!Thsvs.replace (/[^\u4e00-\u9fa5\w]/G,'') ||Event.keycode==189){//regular drop symbols and underscore keyThsv.value='do not enter illegal symbols ['+Thsvs+']'; alert ('do not enter illegal symbols ['+Thsvs+']'); Thsv.value=""; returnfalse; } } } 
  Script><inputonkeyup= "XZ (this,1)"Onpaste= "XZ (this,2)"value="">allow digital letters and kanji<Scriptlanguage= "JavaScript">