我想要一个简单的脚本，让我可以将任何文本传递给它，并从字符串中提取一个键的值。

我希望它灵活，并接受 XML 或 JSON 输入，甚至是格式不正确的输入，例如日志中的文本。

例如，给定以下任何输入，它应该能够提取test键的值。

例如

$ echo "test:5 hi there" | extract_key_value test

应该导致

5

请注意，我不在乎它是用什么写的，所以 node、ruby 等对我来说很好，但是可移植性（Linux/osx）很好;-)

输入1

this is test:5 i saw a value

输入2

this is test:'another value' i saw a value

输入3

this is test=5 i saw a value

输入4

test='a string value here'

输入5

my data
on line 2 test='a string value here'
more data

我对此的快速破解如下，我觉得可以大大改进，感觉应该在某个地方解决！

提取键值

#!/usr/bin/env bash

function show_help()
{
  IT=$(cat <<EOF
  
  Helps you extract a key value from a string, typically a log msg

  usage: key {keyBeginDelim} {keyEndDelim}

  e.g. given "asd f asdf asdf test=easy asdf me=you" as input

  extract_key_value test        
  => returns easy
EOF
)
  echo "$IT"
  exit
}

if [ "$1" == "help" ]
then
  show_help
fi
if [ -z "$1" ]
then
  show_help
fi

INPUT=$(cat -)
KEY="$1"

function getVal()
{
  DELIM1="$1"
  DELIM2="$2"
  echo "$INPUT" | awk -F "$DELIM1" '{print $2}' | awk -F "$DELIM2" '{print $1}'
}

# Try whatever the user passed in or defaults for delims
if [ -n "$2" ]
then
  IT=$(getVal "$2" "$3")
fi

# Try other use cases
if [ -z "$IT" ]
then
  IT=$(getVal "$KEY:'" "'")
fi
if [ -z "$IT" ]
then
  IT=$(getVal "$KEY='" "'")
fi
if [ -z "$IT" ]
then
  IT=$(getVal "$KEY=\"" "\"")
fi
if [ -z "$IT" ]
then
  IT=$(getVal "$KEY:\"" "\"")
fi
if [ -z "$IT" ]
then
  IT=$(getVal "$KEY:" " ")
fi
if [ -z "$IT" ]
then
  IT=$(getVal "$KEY=" " ")
fi
if [ -z "$IT" ]
then
  IT=$(getVal "$KEY=" ";")
fi
if [ -z "$IT" ]
then
  IT=$(getVal "$KEY:" ";")
fi

echo "$IT"