You can also disable the ARC for the RegexKitLite only by adding a flag:
select the project -> YOUR Target -> on the Tab the "Build Phases" and open the "Compile Sources" and add for "RegexKitLite.m" the flag "-fno-objc-arc".
我还是不理解，不过成功了就行。。。
RegexKitLite下载导入项目之后编译提示错误。错误如下
Undefined symbols for architecture i386:
"_uregex_open", referenced from:
_rkl_getCachedRegex in RegexKitLite.o
"_uregex_groupCount", referenced from:
_rkl_getCachedRegex in RegexKitLite.o
"_uregex_setText", referenced from:
_rkl_setCachedRegexToString in RegexKitLite.o
_rkl_clearCachedRegexSetTo in RegexKitLite.o
-[RKLBlockEnumerationHelper initWithRegex:options:string:range:error:] in RegexKitLite.o
"_uregex_start", referenced from:
_rkl_performRegexOp in RegexKitLite.o
_rkl_search in RegexKitLite.o
_rkl_findRanges in RegexKitLite.o
"_uregex_end", referenced from:
_rkl_performRegexOp in RegexKitLite.o
_rkl_search in RegexKitLite.o
_rkl_findRanges in RegexKitLite.o
"_uregex_find", referenced from:
_rkl_search in RegexKitLite.o
"_uregex_findNext", referenced from:
_rkl_search in RegexKitLite.o
_rkl_replaceAll in RegexKitLite.o
"_uregex_reset", referenced from:
_rkl_replaceAll in RegexKitLite.o
"_uregex_appendReplacement", referenced from:
_rkl_replaceAll in RegexKitLite.o
"_uregex_appendTail", referenced from:
_rkl_replaceAll in RegexKitLite.o
"_uregex_close", referenced from:
_rkl_clearCachedRegex in RegexKitLite.o
"_u_errorName", referenced from:
_rkl_userInfoDictionary in RegexKitLite.o
_rkl_makeNSError in RegexKitLite.o
_rkl_NSExceptionForRegex in RegexKitLite.o
"_u_strlen", referenced from:
_rkl_userInfoDictionary in RegexKitLite.o
"_uregex_clone", referenced from:
-[RKLBlockEnumerationHelper initWithRegex:options:string:range:error:] in RegexKitLite.o
ld: symbol(s) not found for architecture i386
collect2: ld returned 1 exit status
解决办法：
In project setting search "other" at Other Linker Flags put the word "-licucore".
编译设置的Other Linker Flags中添加“－licucore”
引用地址：
http://www.iphonedevsdk.com/forum/iphone-sdk-development/8584-regexkitlite-wouldnt-compile.html