如何刪除字符串中未由空格分隔的前兩個單詞？

Question

我有一個字符串，它看起來像這樣：

"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,..." 

我雖然這樣做的去除Product Description：

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

但我得到這個：

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

我想我只是告訴Ruby刪除單詞Product Description（加空格）中的所有字母。但我只想刪除前兩個單詞。

這樣做的正確方法是什麼？

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

您也可以使用String#sub方法。

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

，我認爲也可以代替「產品說明」的任何連續出現次數

編輯：falsetru的答案是技術上的優勢，OP。你應該嘗試一下。

Answer 3

一個非常乾淨的方式來做到這一點是：

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,..." 

雖然你可以使用剝離的第一個「得罪」文本搜索和替換，因爲你知道你想要忽略的東西，你需要休息，你可以輕鬆地跳過它，並告訴Ruby只返回所需的文本。所以，抓住你想要的東西，忘記刪除不需要的文本。

String的[]方法對此非常有用。除其他事項外，它讓我們通過與捕獲組正則表達式，然後返回僅捕獲文本：

str[regexp, capture] → new_str or nil