swift 正则表达式运用实例选自《swifter 100个swift开发必备tip 》

structregexHelper{
letregex:NSRegularExpression?
init(_pattern:String){
varerror:NSError?
regex=NSRegularExpression(pattern:pattern,options:.CaseInsensitive,error:&error)
}
funcmatch(input:String)->Bool{
ifletmatches=regex?.matchesInString(input,options:nil,range:NSMakeRange(0,count(input))){
returnmatches.count>0
}else{
returnfalse
}
}
}


//验证方式

letmailPattern="^([a-z0-9_\\.-]+)@([\\da-z\\.-]+)\\.([a-z\\.]{2,6})$"
letmatcher=RegexHelper(mailPattern)



letmaybeMailAddress="[e-mail]"

ifmatcher.match(maybeMailAddress)
{
println("有效的邮箱地址")
}
else
{
println("无效的邮箱地址")

}