用其他字符替换字符串中的字符(唯一的然后是通配符值)

问题描述

我有一个 NSString，比如说 "H,L,K,P" 我怎样才能检测到一个特定的字符而不是一个通配符...例如，检查 ",*" 将返回 ",L" ",K" 和 ",P" 因为它们都有特定的 ","，然后它们后面都有一个字符.然后我想用它自己加上一个句点"替换那个字符串.

I have an NSString, let's say "H,L,K,P" how can I detect a specific character than then a wild-car character... for example, checking for ",*" would return ",L" ",K" and ",P" because they all have the specific "," and then they all have a character after them. Then I want to replace that string with itself plus a "period" appended to it.

所以H,L,K,P"会变成H,L.,K.,P"

So "H,L,K,P" would become "H,L.,K.,P."

推荐答案

使用正则表达式.搜索模式是:

Use a regular expression. The search pattern would be:

,(.)

替换模式是:

,$1.

示例代码:

NSString *string = @"H,L,K,P";
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@",(.)"
                                    options:0
                                    error:&error];
NSString *modifiedString = [regex stringByReplacingMatchesInString:string
                                    options:0
                                    range:NSMakeRange(0, [string length])
                                    withTemplate:@",$1."];

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