ruby-on-rails - Rails：匹配后截断字符串

Question

假设我有一个这样的字符串：

"This belongs to that then there's this other keyword which does something else."

我将如何截断它，以便它找到keyword并截断keyword which does something else.只给我：

"This belongs to that then there's this other "

谢谢！

Answer 1

1.9.3p327 > str = "This belongs to that then there's this other keyword which does something else."
 => "This belongs to that then there's this other keyword which does something else."
1.9.3p327 > str.sub(/keyword.*/, '')
 => "This belongs to that then there's this other "

不过要小心，因为这也会匹配“keywordwithnotrailingspace”。查看 \b 以获得单词边界...

Answer 2

添加到您的工具带的一个简单工具是Rubular。你可以在你的浏览器中测试各种很棒的正则表达式......教人钓鱼......你知道这句话。:)

@emm - 我认为@Philip 的回答是正确的；但是，我会结合使用这两个答案并选择keyword[.|\s]*