Question

我一直在努力做一个sed替换。出于某种原因，我只能围绕sed和正则表达式（这是我的第二个sed问题）

基本上我想查找文本并替换然后找到下一个出现的某些文本并替换

到目前为止，我有这个

echo "This could be anywhere and this bit should be changed \$\{hcvar-BookName\} and this would remain" | sed 's/$\\{hcvar-/" + hcvar-/g'

返回：

*This could be anywhere and this bit should be changed " + hcvar-BookName\} and this would remain*

但是我想要回归

*This could be anywhere and this bit should be changed " + hcvar-BookName + " and this would remain*

这将用+＆＃34;

替换}

逻辑如下：

Find: \$\{hcvar-
Replace with:  " + hcvar-
Then find the next occurrence of: \}
Replace with: + "

要替换的第二个位将在包含以下内容的字符串后面：hcvar-

这适用于以下字符串示例

这可能是任何地方，应该改变这一点 \ $ {hcvar-BookName}，这将保持
这可能是任何地方这个位应该改为\ $ {hcvar-somethingelse}，这样就可以了保持
这可能是任何地方，应该改变这一点 \ $ {hcvar-wouldnevercontainspaces}这将保持

任何帮助都将不胜感激。

Answer 1

假设您的输入实际上是：

... changed ${hcvar-BookName} and ...

然后以下内容将起作用：

$ sed 's/${\([^}]*\)}/" + \1 + "/' file.txt
This could be anywhere and this bit should be changed " + hcvar-BookName + " and this would remain

注意使用单引号来保留shell的特殊字符：

$ echo '...changed ${hcvar-BookName} and ...' | sed '...'

如果输入确实使用\{，即：... $\{hello\} ...，那么这可能有效：

$ sed 's/$\\{\([^}]*\)\\}/" + \1 + "/' file.txt
This could be anywhere and this bit should be changed " + hcvar-BookName + " and this would remain

故障：

s/            /          / # Replace ... with ...
  ${         }             # Literal ${ and literal }
    \(     \)              # \( and \) is a capturing group
      [^}]*                # Match everything but } zero or more times
               " + \1 + "  # \1 will be expanded to the captured result
                           # from \(, \). The rest is literal

如果您需要在每一行上进行多次替换，请添加g个小文：

s/pattern/replacement/g
#                     ^ Global flag

Answer 2

你需要用反斜杠逃避$：

echo "This could be anywhere and this bit should be changed \$\{hcvar-BookName\} and this would remain" | sed -e 's/\$\\{hcvar-/" + hcvar-/g' -e 's/\\}/ +/'

输出：

This could be anywhere and this bit should be changed " + hcvar-BookName + and this would remain

在之前和之后查找替换字符串

2 个答案: