匹配序列化的字符串[重复]

Question

This question already has an answer here:

• Regexp won't match 2 answers

I am receiving this string "\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80J\x13\x80SQ\x80L\xe0\x80@\x92\x80L?\x80H\xe0" from a function (which runs a GET command on a redis bitmap and gives me the serialized string)

But due to escape sequences I am having trouble matching this kind of pattern. Can some please tell me the regex sequence that will match this kind of string?

</div>

Answer 1

First, I'd try to find out how to get that same data from Redis in its direct, binary, form (as []byte); the rest would be way more simple then.

But to deal with this stuff in its present form, I would first normalize the input string—replacing all those backslash-escaped hex-encoded characters with their equivalent bytes.

This would allow easily searchig for the exact values of these bytes—possibly using backslash-escaped hex-encoded characters in the patterns:

package main

import (
    "fmt"
    "strconv"
    "strings"
)

func main() {
    s := "\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80J\x13\x80SQ\x80L\xe0\x80@\x92\x80L?\x80H\xe0"
    s, err := strconv.Unquote(`"` + s + `"`)
    if err != nil {
        panic(err)
    }
    fmt.Println(strings.Index(s, "\x80SQ\x80L"))
}

Playground link.