按如下所示修改您的sed命令应提取您想要的内容，

Modify your sed command as followed should extract what you want,

sed -e "$(sed 's:\<.*\>:s/&\\w*\\s//ig:' file.txt)"

简要说明，

• \b匹配单词和非字母数字字符之间的位置.在这种情况下，file.txt中的模式"test"将与"Testing"不匹配.
• 通过这种方式，修改附加了\w*的搜索模式应该可以. \w实际上与[a-zA-Z0-9_]
相匹配
• 并且不要忘记消除每个搜索模式后面的空间，应添加\s.

• \b matches the position between a word and a non-alphanumeric character. In this case, the pattern 'test' in file.txt would not match 'Testing'.
• In this way, modify the searched pattern appended with \w* should work. \w actually matched [a-zA-Z0-9_]
• And don't forget to eliminate the space behind each searched pattern, \s should be added.