What regular expressions mean in iOS

\d matches any number, i.e. [0-9]

\d+ represents more than 1 digits

\d* flag 0 or more digits

\s represents a delimiter, including spaces, tabs, and line breaks

\s* 0 or more separators

\w represents letters, numbers, and underscores, as well as Unicode characters, which are different in different languages.

\W{4} represents 4 non-whitespace characters

. Represents any one character, not including line breaks

. * denotes any number of characters and does not include line break

^ ([0-9]) denotes the beginning of a number

([0-9]) $ denotes the end of a number

([0-9a-za-z]) denotes a digital letter

| An expression or a relationship, such as a \d|\w that represents a number or letter.

(.| [\ r \ n]) * denotes any number of characters, including line break, greedy scan

(.| [\ r \ n]) *? Represents any number of characters, including line breaks, lazy scan

(?:.|   [\\r\\n]) To (?: The beginning of the grouping information, indicating not to read into the buffer , to avoid the side effects of Rangeatindex calls, you will also encounter such a (?:

For regular expressions, see http://www.cnblogs.com/light169/archive/2006/10/18/532347.html

//Email+ (BOOL) Validateemail: (NSString *) email{NSString*emailregex =@"[A-z0-9a-z._%+-][email protected][a-za-z0-9.-]+\\. [A-za-z] {2,4}"; Nspredicate*emailtest = [Nspredicate predicatewithformat:@"Self MATCHES%@", Emailregex]; return[Emailtest evaluatewithobject:email];}//Mobile phone number verification+ (BOOL) Validatemobile: (NSString *) mobile{//phone number starts with 13, 15, 18, eight \d numeric charactersNSString *phoneregex =@"^ ((13[0-9)) | ( 15[^4,\\D]) | (18[0,0-9])) \\d{8}$"; Nspredicate*phonetest = [Nspredicate predicatewithformat:@"Self MATCHES%@", Phoneregex]; return[Phonetest evaluatewithobject:mobile];}//License plate number Verification+ (BOOL) Validatecarno: (NSString *) carno{NSString*carregex =@"^[\u4e00-\u9fa5]{1}[a-za-z]{1}[a-za-z_0-9]{4}[a-za-z_0-9_\u4e00-\u9fa5]$"; Nspredicate*cartest = [Nspredicate predicatewithformat:@"Self MATCHES%@", Carregex]; NSLog (@"Cartest is%@", cartest); return[Cartest Evaluatewithobject:carno];}//Model+ (BOOL) Validatecartype: (NSString *) cartype{NSString*cartyperegex =@"^[\u4e00-\u9fff]+$"; Nspredicate*cartest = [Nspredicate predicatewithformat:@"Self MATCHES%@", Cartyperegex]; return[Cartest Evaluatewithobject:cartype];}//User name+ (BOOL) Validateusername: (NSString *) name{NSString*usernameregex =@"^[a-za-z0-9]{4,20}+$"; Nspredicate*usernamepredicate = [Nspredicate predicatewithformat:@"Self MATCHES%@", Usernameregex]; BOOL B=[Usernamepredicate Evaluatewithobject:name]; returnB;}//Password+ (BOOL) ValidatePassword: (NSString *) password{NSString*passwordregex =@"^[a-za-z0-9]{6,20}+$"; Nspredicate*passwordpredicate = [Nspredicate predicatewithformat:@"Self MATCHES%@", Passwordregex]; return[Passwordpredicate Evaluatewithobject:password];}//Nickname+ (BOOL) Validatenickname: (NSString *) nickname{NSString*nicknameregex =@"([\u4e00-\u9fa5]{2,5}) (&middot;[ \u4e00-\u9fa5]{2,5}) *"; Nspredicate*passwordpredicate = [Nspredicate predicatewithformat:@"Self MATCHES%@", Nicknameregex]; return[Passwordpredicate evaluatewithobject:nickname];}//ID Number+ (BOOL) Validateidentitycard: (NSString *) identitycard{BOOL flag; if(Identitycard.length <=0) {flag=NO; returnFlag; } nsstring*regex2 =@"^ (\\d{14}|\\d{17}) (\\d|[ XX]) $"; Nspredicate*identitycardpredicate = [Nspredicate predicatewithformat:@"Self MATCHES%@", Regex2]; return[Identitycardpredicate Evaluatewithobject:identitycard];}//Bank card+ (BOOL) Validatebankcardnumber: (NSString *) bankcardnumber{BOOL flag; if(Bankcardnumber.length <=0) {flag=NO; returnFlag; } nsstring*regex2 =@"^ (\\d{15,30})"; Nspredicate*bankcardpredicate = [Nspredicate predicatewithformat:@"Self MATCHES%@", Regex2]; return[Bankcardpredicate evaluatewithobject:bankcardnumber];}//Bank card after four people+ (BOOL) Validatebankcardlastnumber: (NSString *) bankcardnumber{BOOL flag; if(Bankcardnumber.length! =4) {flag=NO; returnFlag; } nsstring*regex2 =@"^ (\\d{4})"; Nspredicate*bankcardpredicate = [Nspredicate predicatewithformat:@"Self MATCHES%@", Regex2]; return[Bankcardpredicate evaluatewithobject:bankcardnumber];}//CVN+ (BOOL) Validatecvncode: (NSString *) cvncode{BOOL flag; if(Cvncode.length <=0) {flag=NO; returnFlag; } nsstring*regex2 =@"^ (\\d{3})"; Nspredicate*cvncodepredicate = [Nspredicate predicatewithformat:@"Self MATCHES%@", Regex2]; return[Cvncodepredicate Evaluatewithobject:cvncode];}//Month+ (BOOL) Validatemonth: (NSString *) month{BOOL flag; if(!month.length = =2) {flag=NO; returnFlag; } nsstring*regex2 =@"(^ (0) ([0-9]) $) | (^ (1) ([0-2])"; Nspredicate*monthpredicate = [Nspredicate predicatewithformat:@"Self MATCHES%@", Regex2]; return[Monthpredicate evaluatewithobject:month];}//Month+ (BOOL) Validateyear: (NSString *) year{BOOL flag; if(!year.length = =2) {flag=NO; returnFlag; } nsstring*regex2 =@"^ ([1-3]) ([0-9]) $"; Nspredicate*yearpredicate = [Nspredicate predicatewithformat:@"Self MATCHES%@", Regex2]; return[Yearpredicate evaluatewithobject:year];}//Verifycode+ (BOOL) Validateverifycode: (NSString *) verifycode{BOOL flag; if(!verifycode.length = =6) {flag=NO; returnFlag; } nsstring*regex2 =@"^ (\\d{6})"; Nspredicate*verifycodepredicate = [Nspredicate predicatewithformat:@"Self MATCHES%@", Regex2]; return[Verifycodepredicate Evaluatewithobject:verifycode];}