java regex直到某些单词/文本/字符

Question

请考虑以下文字：

That is, it matches at any position that has a non-word character to the left of it, and a word character to the right of it.

如何获得以下结果：

That is, it matches at any position that has a non-word character to the 

直到left

，这就是一切

Answer 1

input.replace("^(.*?)\\bleft.*$", "$1");

• ^锚定到字符串的开头
• .*?尽可能少地匹配任何字符
• \b匹配字边界
• left匹配字符串文字"left"
• .*匹配字符串的其余部分
• $锚定到字符串的末尾
• $1将匹配的字符串替换为()
中的第1组

如果你想使用任何单词（不只是"left"），请小心逃避它。您可以使用Pattern.quote(word)来转义字符串。

Answer 2

答案实际上是/(.*)\Wleft\w/，但它与

中的任何内容都不匹配

That is, it matches at any position that has a non-word character to the left of it, and a word character to the right of it.

Answer 3

String result = inputString.replace("(.*?)left.*", "$1");