我們可以在gsub中使用關系運算符嗎？

Question

我需要更換. 字符與. \\n . \\n為以下字符串格式。 但是，約束條件是，請勿替換. 僅在以下模式字符串中帶有.\\n字符。

"test was done and was negative. Urine dipstick: ph = 6\\n \\342\\200\\242 spec. Grav.  = 1.015"

我需要以下輸出，例如

"test was done and was negative. \n Urine dipstick: ph = 6\\n \\342\\200\\242 spec. Grav.  = 1.015"

約束是=> "spec. Grav. = 1.015" 。

Answer 1

str = "test was done and was negative. Urine dipstick: ph = 6\\n \\342\\200\\242 spec. Grav.  = 1.015"

puts str.sub('. ', ".\n") 

#=> test was done and was negative.
#=> Urine dipstick: ph = 6\n \342\200\242 spec. Grav.  = 1.015

String.sub僅替換第一個匹配項。

Answer 2

str.gsub(/\.(?! (Grav| =))/, ".\n")

應該做的工作。

簡要說明

• \\. 匹配任何.
• (?!)表示否定的前瞻。 這意味着它將不匹配這些括號中的任何內容。
• (Grav| =)因此后跟Grav或=點將不匹配。

Answer 3

你要這個？

str.gsub(/\.(?!\n)/, "\.\n")