如何在C＃中使用Regex匹配给定的模式？

Question

I have the following input:

-key1:"val1" -key2: "val2" -key3:(val3) -key4: "(val4)" -key5: val5 -key6: "val-6" -key-7: val7 -key-eight: "val 8"

With only the following assumption about the pattern:

• Keys always start with a - followed by a value delimited by :

How can I match and extract each key and it's corresponding value ?

I have so far come up with the following regex :

-(?<key>\\S*):\\s?(?<val>\\S*)

But it's currently not matching the complete value for the last argument as it contains a space but I cannot figure out how to match it.

The expected output should be:

• key1 "val1"
• key2 "val2"
• key3 (val3)
• key4 "(val4)"
• key5 val5
• key6 "val-6"
• key-7 val7
• key-eight val 8

Any help is much appreciated.

Answer 1

Guessing that you want to only allow whitespace characters that are not at the beginning or end, change your regex to:

-(?<key>\S*):\s?(?<val>\S+(\s*[^-\s])*)

This assumes that the character - preceeded by a whitespace unquestioningly means a new key is beginning, it cannot be a part of any value.

For this example:

-key: value -key2: value with whitespace -key3: value-with-hyphens -key4: v

The matches are: -key: value , -key2: value with whitespace , -key3: value-with-hyphens , -key4: v .

It also works perfectly well on your provided example.

Answer 2

I presume you're wanting to keep the brackets and quotation marks as that's what you're doing in the example you gave? If so then the following should work:

-(?<key>\S+):+\s?(?<val>\S+\s?\d+\)?\"?)

This does presume that all val's end with a number though.

EDIT: Given that the val doesn't always end with a number, but I'm guessing it always starts with val, this is what I have:

-(?<key>\S+):+\s?(?<val>\"?\(?(val)+\s?\S+)

Seems to be working properly...

Answer 3

A low tech (non regex) solution, just for an alternative. Trim guff, ToDictionary if you need

var results = input.Split(new[] { " -" }, StringSplitOptions.RemoveEmptyEntries)
                   .Select(x => x.Trim('-').Split(':'));

Full Demo Here

Output

key1 -> "val1"
key2 ->  "val2"
key3 -> (val3)
key4 ->  "(val4)"
key5 ->  val5
key6 ->  "val-6"
key-7 ->  val7
key8 ->  "val 8"

Answer 4

Try this regex using Replace function:

(?:^|(?!\S)\s*)-|\s*:\s*

and replace with "\\n". You should get key values in separate lines.

Answer 5

This should do the trick

-(?<key>\S*):\s*(?<value>(?(?=")((")(?:(?=(\\?))\2.)*?\1))(\S*))

a sample link can be found here . Basically it does and if/else/then to detect if the value contain " as (?(?=")(true regex)(false regex) , the false regex is yours \\S* while the true regex will try to match start/end quote (")(?:(?=(\\\\?))\\2.)*?\\1) .