ruby - 零宽度否定后视断言无法按预期工作

Question

不知何故，零宽度否定后视断言 - 如果前面有\则不匹配 ") - 无法按预期工作。

这是我现在拥有的:

text = <<EOT
h1=_("This is a test")
h2=_("This is a test \"quotes\"")
h3=_("This is a test (\"quotes\")")
EOT

text.scan(/_\("(.*?)(?<!\\)"\)/)

=> [["This is a test"], ["This is a test \"quotes\""], ["This is a test (\"quotes"]]

但结果应该是:

=> [["This is a test"], ["This is a test \"quotes\""], ["This is a test (\"quotes\")"]]

最后的匹配是错误的。

Answer 1

您的文本不包含任何反斜杠(\)

text = <<EOT
h1=_("This is a test")
h2=_("This is a test \"quotes\"")
h3=_("This is a test (\"quotes\")")
EOT
puts text

打印

h1=_("This is a test")
h2=_("This is a test "quotes"")
h3=_("This is a test ("quotes")")

转义反斜杠或使用以下形式:

text = <<'EOT'
h1=_("This is a test")
h2=_("This is a test \"quotes\"")
h3=_("This is a test (\"quotes\")")
EOT
puts text
p text.scan(/_\("(.*?)(?<!\\)"\)/)

打印

h1=_("This is a test")
h2=_("This is a test \"quotes\"")
h3=_("This is a test (\"quotes\")")
[["This is a test"], ["This is a test \\\"quotes\\\""], ["This is a test (\\\"quotes\\\")"]]