正则表达式在Websphere MQ中的使用

Question

由于我是正则表达式的新手，任何人都可以给我以下正则表达式的详细解释： -

ZBC_EXTR[0-9]{0,1}\_STOCK_([A-Z]{0,1}|[0-9]{0,1})

Answer 1

这是正则表达式正在寻找包含各种部分的字符串。

"ZBC_EXTR" - The string must begin with these characters
"[0-9]{0,1}" - Looks for a digit 0-9, can appear 0 times but not more than once
"\" - Escape character(Escapes the following character for regex engine) 
"_STOCK_" - Must have these set of characters next
"(" - Beginning of the group expression
"[A-Z]{0,1}" - Look for alpha, capital character,can appear 0 times but not more than once
"|" - The logic OR expression
"[0-9]{0,1}" - Looks for a digit 0-9, can appear 0 times but not more than once
")" - End of the group expression

例如，以下字符串将匹配正则表达式：

ZBC_EXTR8_STOCK_
ZBC_EXTR_STOCK_
ZBC_EXTR_STOCK_F

但这些字符串不匹配：

ZBC_EXTR_STOCKF
ZBC_EXTRA_STOCK_F
ZBC_EXTR45_STOCK

正则表达式的一个很好的资源：https://www.regular-expressions.info/