PJR-NSString-Category是NSString的分类，可以执行很多字符串操作，包括：
Stringvalidation.
Emailvalidation.
Phonevalidation.
URLvalidation.
Addorremovesubstring.
GetSubstring.
GetApplicationversion.
GetApplicationName.
GenerateArrayfromstring.
GetStringfromArray.
GetNumberofwordsinString.
Checkifmystringcontainsonlyletters,onlynumbersorboth.
ConvertNSDatafromNSString.
示例代码：
//Examples of NSString CategoryNSString *testStr = @"Hello";if([testStr isValid]){ NSLog(@"It is a Valid String");}NSString *blankStr = @" ";if([blankStr isBlank]){ NSLog(@"It is a blank String");}NSString *noOfWordsStr = @"Number of Words";NSLog(@"Number of words are :%d",[noOfWordsStr countNumberOfWords]);if([noOfWordsStr containsString:@"of"]){ NSLog(@"YES");}if([noOfWordsStr isBeginsWith:@"N"]){ NSLog(@"YES");}if([noOfWordsStr isEndssWith:@"s"]){ NSLog(@"YES");}NSLog(@"string after replace charcter is :%@",[noOfWordsStr replaceCharcter:@"of" withCharcter:@"offfff"]);NSLog(@"Get substring :%@",[noOfWordsStr getSubstringFrom:1 to:6]);NSLog(@"Add string :%@",[noOfWordsStr addString:@" are 3"]);NSLog(@"Removed string :%@",[noOfWordsStr removeSubString:@"of"]);NSString *letterStr = @"abcd";NSString *numberStr = @"1234";NSString *letterNuberStr = @"sdf545";if([letterStr containsOnlyLetters]){ NSLog(@"Contanis only letters");}if([numberStr containsOnlyNumbers]){ NSLog(@"Contanis only numbers");}if([letterNuberStr containsOnlyNumbersAndLetters]){ NSLog(@"Contanis letters and numbers");}NSArray *array = [NSArray arrayWithObjects:letterStr,numberStr,letterNuberStr, nil];if([numberStr isInThisarray:array]){ NSLog(@"Yes number string is in this array");}NSLog(@"String from array is :%@",[NSString getStringFromArray:array]);NSLog(@"Array from String is :%@",[noOfWordsStr getArray]);NSLog(@"My Application Version number is :%@",[NSString getMyApplicationVersion]);NSLog(@"My Application name is :%@",[NSString getMyApplicationName]);if([@"pjr@gmail.com" isValidEmail]){ NSLog(@"It is valid Email");}if(![@"21323gf" isVAlidPhoneNumber]){ NSLog(@"It is not valid Phone number");}if([@"https://www.google.com" isValidUrl]){ NSLog(@"It is valid URL");}
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