awk 函数-awk的match函数总结

  开始正文之前，推荐下这里有个介绍awk数组的精华帖：

  grep XXYY..log | tr -d '][' | awk 'BEGIN{ FS="|" }{ [match]2; print $4,a[0],b[0] }'

  match(s, r [, a])

   the in s where the r occurs, or 0 if r is not , and sets the values and . Note that the order is the same as for the ~ : str ~ re. If array a is , a is and then 1 n are filled with the of s that match the esized in r. The 0'th of a the of s by the entire r. a[n, "start"], and a[n, "length"] the index in the string and length , of each .

  两种用法：

  1. 普通用法

  match(字符串,正则表达式)

  内置变量RSTART表示匹配开始的位置awk 函数，表示匹配的长度

  如果匹配到了，返回匹配到的开始位置，否则返回0

  $ awk 'BEGIN{start=match("Abc Ef Kig",/ A-Z+ /);print RSTART,}'

  4 4

  2. 建立数组（If array a is , a is and then 1 n are filled with the of s that match the

   in r. The 0'th of a the of s by the entire

   r. a[n, "start"], and a[n, "length"] the index in the string and length

  , of each .）

  echo " | gawk '{ match($0, /(fo+).+(bar*)/, arr) #匹配到的部分自动赋值到arr中awk 函数，下标从1开始

  print arr[1], arr[2]

  print arr[1, "start"], arr[1, "length"] #二维数组arr[index,＂start＂]值=RSTART

  print arr[2, "start"], arr[2, "length"] #二维数组arr[index,＂length＂]值=

  }'

  foooo

  1 5

  9 7

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