ios中有三种方式来实现正则表达式的匹配。现在将他们都记录在这里：
1.利用nspredicate（谓词）匹配
例如匹配有效邮箱：
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nsstring ＊email ＝ @“nijino_saki@163.com”；
nsstring *regex = @"[a-z0-9a-z._%+-]+@[a-za-z0-9.-]+\\.[a-za-z]{2,4}";
nspredicate *predicate = [nspredicate predicatewithformat:@"self matches %@", regex];
bool isvalid = [predicate evaluatewithobject:email];
谓词匹配比较灵活，但是需要有谓词的相关知识。
2.利用rangeofstring：option：直接查找
nsstring *searchtext = @"// do any additional setup after loading the view, typically from a nib.";
nsrange range = [searchtext rangeofstring:@"(?:[^,])*\\." options:nsregularexpressionsearch];
if (range.location != nsnotfound) {
nslog(@"%@", [searchtext substringwithrange:range]);
}
options中设定nsregularexpressionsearch就是表示利用正则表达式匹配，会返回第一个匹配结果的位置。
3.使用正则表达式类
nsstring *searchtext = @"// do any additional setup after loading the view, typically from a nib.";
nserror *error = null;
nsregularexpression *regex = [nsregularexpression regularexpressionwithpattern:@"(?:[^,])*\\." options:nsregularexpressioncaseinsensitive error:&error];
nstextcheckingresult *result = [regex firstmatchinstring:searchtext options:0 range:nsmakerange(0, [searchtext length])];
if (result) {
nslog(@"%@\n", [searchtext substringwithrange:result.range]);
}
实例：
1.验证邮箱
+ (bool)validateemail:(nsstring *)email
{
nsstring *emailregex = @"[a-z0-9a-z._%+-]+@[a-za-z0-9.-]+\\.[a-za-z]{2,4}";
nspredicate *emailtest = [nspredicate predicatewithformat:@"self matches %@", emailregex];
return [emailtest evaluatewithobject:email];
}
nspredicate是一个foundation类，是用来查询的，原理和用法都类似于sql中的where。
2.验证手机号
简单的判断方法
+ (bool)validatephone:(nsstring *)phone
{
nsstring *phoneregex = @"1[3|5|7|8|][0-9]{9}";
nspredicate *phonetest = [nspredicate predicatewithformat:@"self matches %@", phoneregex];
return [phonetest evaluatewithobject:phone];
}
这只是简单地判断手机号格式。其实手机的格式还是有一点复杂的。
详细的判断方法
//正则判断手机号码格式
+ (bool)validatephone:(nsstring *)phone
{
/**
* 手机号码
* 移动：134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188
* 联通：130,131,132,152,155,156,185,186
* 电信：133,1349,153,180,189
*/
nsstring * mobile = @"^1(3[0-9]|5[0-35-9]|8[025-9])\\d{8}$";
/**
* 中国移动：china mobile
* 134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188
*/
nsstring * cm = @"^1(34[0-8]|(3[5-9]|5[017-9]|8[278])\\d)\\d{7}$";
/**
* 中国联通：china unicom
* 130,131,132,152,155,156,185,186
*/
nsstring * cu = @"^1(3[0-2]|5[256]|8[56])\\d{8}$";
/**
* 中国电信：china telecom
* 133,1349,153,180,189
*/
nsstring * ct = @"^1((33|53|8[09])[0-9]|349)\\d{7}$";
/**
* 大陆地区固话及小灵通
* 区号：010,020,021,022,023,024,025,027,028,029
* 号码：七位或八位
*/
// nsstring * phs = @"^0(10|2[0-5789]|\\d{3})\\d{7,8}$";
nspredicate *regextestmobile = [nspredicate predicatewithformat:@"self matches %@", mobile];
nspredicate *regextestcm = [nspredicate predicatewithformat:@"self matches %@", cm];
nspredicate *regextestcu = [nspredicate predicatewithformat:@"self matches %@", cu];
nspredicate *regextestct = [nspredicate predicatewithformat:@"self matches %@", ct];
if (([regextestmobile evaluatewithobject:phone] == yes)
|| ([regextestcm evaluatewithobject:phone] == yes)
|| ([regextestct evaluatewithobject:phone] == yes)
|| ([regextestcu evaluatewithobject:phone] == yes))
{
if([regextestcm evaluatewithobject:phone] == yes) {
nslog(@"china mobile");
} else if([regextestct evaluatewithobject:phone] == yes) {
nslog(@"china telecom");
} else if ([regextestcu evaluatewithobject:phone] == yes) {
nslog(@"china unicom");
} else {
nslog(@"unknow");
}
return yes;
}
else
{
return no;
}
}
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