我们可以在gsub中使用关系运算符吗？

Question

我需要更换. 字符与. \\n . \\n为以下字符串格式。 但是，约束条件是，请勿替换. 仅在以下模式字符串中带有.\\n字符。

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

我需要以下输出，例如

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

约束是=> "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仅替换第一个匹配项。

Answer 2

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

应该做的工作。

简要说明

• \\. 匹配任何.
• (?!)表示否定的前瞻。 这意味着它将不匹配这些括号中的任何内容。
• (Grav| =)因此后跟Grav或=点将不匹配。

Answer 3

你要这个？

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