Question

我有一个看起来像这样的字符串：

"Product DescriptionThe Signature Series treatment makes the strategy
guide a COLLECTIBLE ITEM for StarCraft II fans. Single-player CAMPAIGN
WALKTHROUGH covers all possible mission branches, including bonus
objectives throughout the campaign. Exclusive MAPS found only in the
official guide, show locations of units,..."

我这样做是为了删除Product Description：

description_hash[:description] = @data.at_css('.featureReview span').text[/.*\.\.\./m].delete("Product Description")

但我得到了这个：

"ThSgaSammakhagygaCOLLECTIBLEITEMfSaCafIIfa.Sgl-layCAMAIGNWALKTHROUGHvallblmbah,lgbbjvhghhamag.ExlvMASflyhffalg,hwlaf,..."

我想我刚刚告诉Ruby删除单词Product Description（加空格）中的所有字母。但我只想删除前两个单词。

这样做的正确方法是什么？

Answer 1

text = "Product DescriptionThe Signature Series treatment makes the strategy guide a COLLECTIBLE ITEM for StarCraft II fans. Single-player CAMPAIGN WALKTHROUGH covers all possible mission branches, including bonus objectives throughout the campaign. Exclusive MAPS found only in the official guide, show locations of units,..."
text[/.*\.\.\./m].sub(/\AProduct Description/, '')
# => "The Signature Series treatment makes the strategy guide a COLLECTIBLE ITEM for StarCraft II fans. Single-player CAMPAIGN WALKTHROUGH covers all possible mission branches, including bonus objectives throughout the campaign. Exclusive MAPS found only in the official guide, show locations of units,..."

Answer 2

您还可以使用String#sub方法。

2.0.0-p247 :011 > foo.sub("Product Description", "")

我认为

也可能取代任何连续出现的“产品描述”

编辑：falsetru的答案在技术上更优越，OP。你应该尝试一下。

Answer 3

真正干净的方法是：

str = "Product DescriptionThe Signature Series treatment makes the strategy guide a COLLECTIBLE ITEM for StarCraft II fans. Single-player CAMPAIGN WALKTHROUGH covers all possible mission branches, including bonus objectives throughout the campaign. Exclusive MAPS found only in the official guide, show locations of units,..."

str[/\AProduct Description(.+)/, 1] # => "The Signature Series treatment makes the strategy guide a COLLECTIBLE ITEM for StarCraft II fans. Single-player CAMPAIGN WALKTHROUGH covers all possible mission branches, including bonus objectives throughout the campaign. Exclusive MAPS found only in the official guide, show locations of units,..."

虽然你可以使用搜索和替换删除第一个“违规”文本，因为你知道你想要忽略什么，而你想要其余的，你可以轻松地跳过它并告诉它Ruby只返回所需的文本。所以，抓住你想要的东西，忘记删除不需要的文字。

String的[]方法对此非常有用。除此之外，它还允许我们使用捕获组传递正则表达式，然后仅返回捕获的文本：

str[regexp, capture] → new_str or nil

如何删除字符串中未被空格分隔的前两个单词？

3 个答案: