我想要以下形式的句柄字符串:
PREFIX_TYPE_N,DATA
那么,*awk (gawk, mawk, nawk) 是否支持在已匹配字符串的操作中包含模式匹配?像这样的东西(当然,对我不起作用):
*awk 'BEGIN { FS="," }
/PREFIX/ {
/TYPE_1/ {printf "[TYPE1] [DATA: $2]"} // <-- included pattern
/TYPE_2/ {printf "[TYPE2] [DATA: $2]"} // <-- another included pattern
... // <-- some more included patterns
}' "filename"
或者我还需要 if/else 或 switch/case 吗?
最佳答案
不完全是那种方式,但非常接近,因为有一个正则表达式匹配运算符 (~):
BEGIN { FS="," }
/PREFIX/ {
if ($1 ~ "TYPE_1") {printf "[TYPE1] [DATA: $2]"} // <-- included pattern
if ($1 ~ "TYPE_2") {printf "[TYPE2] [DATA: $2]"} // <-- another included pattern
... // <-- some more included patterns
}
请注意,因为第一个模式匹配已经进入其 block ,并且只处理了一行,所以 block 中只有 ifs 是可以的。
如果你真的想要模式的易读性,你可以这样做:
BEGIN { FS="," }
/PREFIX/ { //stuff to do for all prefixes, before specific handling
data = $2 }
/PREFIX_TYPE_1/ { type = "TYPE_1"; }
/PREFIX_TYPE_2/ { type = "TYPE_2"; }
/PREFIX/ { //stuff to do for all prefixes, after specific handling
printf("[%s] [DATA: $2]", type, data)
}
关于regex - awk 扩展模式匹配(在已匹配字符串的操作中嵌入模式匹配),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12283412/