java - 解码正则表达式

Question

我正在寻找解码正则表达式。
有没有办法检查以下正则表达式的含义：

^(PC([Y\\d])|GC([Y\\d])|Y|\\d)\\d{4,5}$

Answer 1

您可以在http://www.myezapp.com/apps/dev/regexp/show.ws或http://www.debuggex.com/使用正则表达式分析器

^ = start of string
() = capturing groups
[] = character classes
\d = digit in 0-9
\\ = literal backslash
| = OR
{} = count of leading item
$ = end of string