剥离非字母数字字符但在 Ruby 中留下空格
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Stripping non-alphanumeric chars but leaving spaces in Ruby
提问by RailsTweeter
Trying to change this:
试图改变这一点：
"The basketball-player is great! (Kobe Bryant)"
into this:
进入这个：
"the basketball player is great kobe bryant"
Want to downcase and remove all punctuation but leave spaces...
想要小写并删除所有标点符号但留下空格...
Tried string.downcase.gsub(/[^a-z ]/, '')but it removes the spaces
尝试过，string.downcase.gsub(/[^a-z ]/, '')但它删除了空格
回答by gmalette
You can simply add \s(whitespace)
您可以简单地添加\s（空格）
string.downcase.gsub(/[^a-z0-9\s]/i, '')
string.downcase.gsub(/[^a-z0-9\s]/i, '')
回答by fl00r
If you want to catch non-latin characters, too:
如果您也想捕获非拉丁字符：
str = "The basketball-player is great! (Kobe Bryant) (ひらがな)"
str.downcase.gsub(/[^[:word:]\s]/, '')
#=> "the basketballplayer is great kobe bryant ひらがな"
回答by pguardiario
Some fine solutions, but simplest is usually best:
一些很好的解决方案，但最简单的通常是最好的：
string.downcase.gsub /\W+/, ' '
回答by DrewB
All the other answers strip out numbers as well. That works for the example given but doesn't really answer the question which is how to strip out non-alphanumeric.
所有其他答案也删除了数字。这适用于给出的示例，但并没有真正回答如何去除非字母数字的问题。
string.downcase.gsub(/[^\w\s]/, '')
Note this will not strip out underscores. If you need that then:
请注意，这不会去掉下划线。如果你需要，那么：
string.downcase.gsub(/[^a-zA-Z\s\d]/, '')
回答by Ivaylo Strandjev
a.downcase.gsub(/[^a-z ]/, "")
a.downcase.gsub(/[^a-z ]/, "")
Note the whitespace I have added after a-z. Also if you want to replace all whitespaces(not only space use \s as proposed by gmalette).
请注意我在 az 之后添加的空格。此外，如果您想替换所有空格（不仅仅是空格，请使用 gmalette 建议的 \s）。
回答by Renaud Humbert-Labeaumaz
All the previous answers make basketball-player into basketballplayer or remove numbers entirely, which is not exactly what is required.
之前的所有答案都使篮球运动员成为篮球运动员或完全删除数字，这并不完全是必需的。
The following code does exactly what you asked:
以下代码完全符合您的要求：
text.downcase
.gsub(/[^[:word:]\s]/, ' ') # Replace sequences of non-alphanumerical chars by a single space
Hope this helps someone!
希望这可以帮助某人！
