在一行中查找不区分大小写的单词匹配

问题描述

我需要查找一行中出现的所有单词，但搜索必须不区分大小写.我还需要在正则表达式中添加什么?

I need to look for all occurrences of a word in a line, but the search must be case insensitive. What else do I need to add to my regular expression?

arr = line.scan(/\s+#{word}\s+/)

推荐答案

你需要修饰符 /i

arr = line.scan(/\b#{word}\b/i)

http://www.tutorialspoint.com/ruby/ruby_regular_expressions.htm

最好使用 \b 作为单词边界，因为正则表达式中的第二个 \s+ eats 空格，这可能用于另一个匹配词的第一个 \s+ ；您的正则表达式在行首和行尾也失败:

And better to use \b for word boundaries, because the second \s+ in your regex eats spaces, which may be used for the first \s+ of another matched word; also your regex fails on the beginning and the end of line:

> "asd asd asd asd".scan /\s+asd\s+/
=> [" asd "]
> "asd asd asd asd".scan /\basd\b/
=> ["asd", "asd", "asd", "asd"]

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