結合多個Ruby功能

Question

將這些功能結合起來最簡單的方法是什麼？ 我試圖刪除整數，浮點數，和特定的詞

string = "5 basic sent cards by 4.55" 

string.delete("0-9.") 
string.slice! "sent" 
string.slice! "by" 

puts string 

#desired output: basic cards 

Answer 1

使用正則表達式：

string.gsub! /[0-9.]|sent|by/, '' 

要刪除連續空間的運行（即basic cards - >basic cards），嘗試：

string = string.squeeze(' ').strip 

Answer 2

小心使用正則表達式：天真的模式可以是非常具有破壞性的輸入：

"5 basic sent cards by 4.55".gsub(/[0-9.]|sent|by/, '') # => " basic cards " 
"5 basic present cards bye 4.55".gsub(/[0-9.]|sent|by/, '') # => " basic pre cards e " 

"5 basic sent cards by 4.55".gsub(/[\d.]+|\b(?:sent|by)\b/, '') # => " basic cards " 
"5 basic present cards bye 4.55".gsub(/[\d.]+|\b(?:sent|by)\b/, '') # => " basic present cards bye " 

添加字邊界檢查可防止字符串內匹配和誤報。