需要帮助在 bash 脚本中使用 grep/egrep 匹配问题

问题描述

我试图匹配给定字符串的所有字符，但这些字符应该按照给定 bash 脚本的顺序匹配.

I am trying to match all characters of given string but those characters should match in the order as given to the bash script.

while [[ $# -gt 0 ]]; do
  case $1 in
       -i)
    arg=$2
    egrep "*[$arg]*" words.txt
    shift ;;
  esac
  shift
done

$ sh match_the_pattern.sh -i aei words.txt

应该返回类似的词

abstentious
adventitious
sacrilegiousness

如果您注意到，首先匹配a，然后是e，然后是i，它们都是有序的.另外，整个单词都被匹配和过滤了.

If you notice, first a is matched then e and then i, all of them are in order. Plus, the whole word is matched and filtered.

推荐答案

改变这个:

arg=$2
egrep "*[$arg]*" words.txt

为此:

arg=$(sed 's/./.*[&]/g' <<< "$2")
grep "$arg" words.txt

如果这不是您所需要的全部，那么请编辑您的问题以阐明您的要求并提供更具代表性的样本输入/输出.

If that's not all you need then edit your question to clarify your requirements and provide more truly representative sample input/output.

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