如何使用正则表达式删除仅包含单词的字符串？

Question

1 line: "*hello:  "
2 line: "*hello:    "
3 line: "*hello: person answered"

想完全删除第 1 行和第 2 行，但想保留第 3 行，而不是变成：

"*hello:person answered"

尝试过：

line = line.replaceAll("*hello:(\s*)","");

Answer 1

你可以简单地做

line = line.replaceAll("^\*hello:\s*$","");

或

line = line.replaceAll("\*hello:\s*(?!.*\w)","");

这应该用于 you.See 演示。

How to delete a string only containing a word using regex?