我有一个自定义传输格式，可以将数据打包成以下格式
[a:000,"name","field","field","field"]
我正在尝试拆分各个行以获取左括号之后的第一个字符和所有 CSV 值。 a、000、“名称”、“字段”、“字段”等...
我拼凑起来
[^?,:\[\]]
这会将所有单个字符拆分出来，而不是冒号/逗号分隔的字段。 我知道这不会在引号中容纳逗号。所以这显然是垃圾！
嵌入逗号并不是真正的大问题，因为我们控制着两端的数据，所以我可以避开它们。
感谢您的任何见解！
【问题讨论】：
标签： regex csv data-transfer
与其尝试拆分多个字符并忽略其中一些，不如尝试匹配您想要匹配的任何字符。由于您没有指定实现语言，因此我将其发布为 Perl，但您可以将其应用于任何支持后向和前瞻的风格。
while ($subject =~ m/(\w+(?=:)|(?<=:)\d+|(?<=,")[^"]*?(?="))/g) {
# matched text = $&
}
说明：
# (\w+(?=:)|(?<=:)\d+|(?<=,")[^"]*?(?="))
#
# Match the regular expression below and capture its match into backreference number 1 «(\w+(?=:)|(?<=:)\d+|(?<=,")[^"]*?(?="))»
# Match either the regular expression below (attempting the next alternative only if this one fails) «\w+(?=:)»
# Match a single character that is a “word character” (letters, digits, and underscores) «\w+»
# Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
# Assert that the regex below can be matched, starting at this position (positive lookahead) «(?=:)»
# Match the character “:” literally «:»
# Or match regular expression number 2 below (attempting the next alternative only if this one fails) «(?<=:)\d+»
# Assert that the regex below can be matched, with the match ending at this position (positive lookbehind) «(?<=:)»
# Match the character “:” literally «:»
# Match a single digit 0..9 «\d+»
# Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
# Or match regular expression number 3 below (the entire group fails if this one fails to match) «(?<=,")[^"]*?(?=")»
# Assert that the regex below can be matched, with the match ending at this position (positive lookbehind) «(?<=,")»
# Match the characters “,"” literally «,"»
# Match any character that is NOT a “"” «[^"]*?»
# Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?»
# Assert that the regex below can be matched, starting at this position (positive lookahead) «(?=")»
# Match the character “"” literally «"»
【讨论】：
您当然可以通过正则表达式来执行此操作，但合适的工具很可能是 CSV 解析器。你可以试试 Dave DeLong 为 Objective C 编写的这个：
【讨论】：