如何删除额外的双引号？

Question

在格式错误的.c​​sv文件中,有一行带有额外双引号的数据,例如最后一行:

Name,Comment
"Peter","Nice singer"
"Paul","Love "folk" songs"

如何删除双引号folk并将字符串替换为:

Name,Comment
"Peter","Nice singer"
"Paul","Love _folk_ songs"

Answer 1

在Ruby 1.9中,以下工作:

result = subject.gsub(/(?<!^|,)"(?!,|$)/, '_')

以前的版本没有lookbehind断言.

说明:

(?<!^|,)  # Assert that we're not at the start of the line or right after a comma
"         # Match a quote
(?!,|$)   # Assert that we're not at the end of the line or right before a comma

当然,这假设我们不会遇到类似病态的病例

"Mary",""Oh," she said"