ruby - 检查给我\\但只放\

为什么我的结果和两个不同？

test_string = "C:/Program Files/TestPro/TestPro Automation Framework/"
puts test_string.gsub("/","\\\\")

#result is : C:\Program Files\TestPro\TestPro Automation Framework\

puts
puts test_string.gsub("/","\\\\") .inspect

#result as desired : C:\\Program Files\\TestPro\\TestPro Automation Framework\\

最佳答案

ruby的String.inspect转义所有特殊字符，这就是为什么用.inspect看到“\\”
参见此处的String.inspectsource

if (c == '"'|| c == '\\' ||
    (c == '#' &&
     p < pend &&
     MBCLEN_CHARFOUND_P(rb_enc_precise_mbclen(p,pend,enc)) &&
     (cc = rb_enc_codepoint(p,pend,enc),
      (cc == '$' || cc == '@' || cc == '{')))) {
    if (p - n > prev) str_buf_cat(result, prev, p - n - prev);
    str_buf_cat2(result, "\\");
    prev = p - n;
    continue;
}

基本上，if c == '\'，将“\”连接到它，所以它变成了“\\”
如果要对反斜杠进行双转义，则需要尝试

test_string = "C:/Program Files/TestPro/TestPro Automation Framework/"
puts test_string.gsub("/","\\\\\\\\")

#C:\\Program Files\\TestPro\\TestPro Automation Framework\\