正则表达式匹配失败$pattern="/(\d{4}\W\d{2}\W\d{1})\s({1}\d{2}\W\d{2}\W\d{2})\s(am|pm)/";\x05$str="todayis2010-12-512:12:12pm";Compilationfailed:nothingtorepeatatoffset

Question

正则表达式匹配失败
$pattern="/(\d{4}\W\d{2}\W\d{1})\s({1}\d{2}\W\d{2}\W\d{2})\s(am|pm)/";
\x05$str="today is 2010-12-5 12:12:12 pm";
Compilation failed:nothing to repeat at offset

Answer 1

$a = "abc";$b = "b";if ($a=~m/$b/){\x09print $a;}上述代码运行无误,怀疑楼主的$a里是不是没有引号?请楼主贴出完整代码,或者至少贴出$a和$b的内容.