Go：拆分一个由逗号分隔的键值对字符串，并在给定的键价值对中嵌入可能的逗号

匹配(全局)，而不是拆分，那么你就不需要环顾四周:(.*?)=([^=]*)(?:,|$).在围棋中:

package kvparse

import (
    "regexp"
    "testing"
    "reflect"
)

var kvPairRe = regexp.MustCompile(`(.*?)=([^=]*)(?:,|$)`)
func ParseKV(kvStr string) map[string]string {
    res := map[string]string{}
    for _, kv := range kvPairRe.FindAllStringSubmatch(kvStr, -1) {
        res[kv[1]] = kv[2]
    }
    return res
}

func TestParseKV(t *testing.T) {
    test := func(kvStr string, expectedMap map[string]string) {
        gotMap := ParseKV(kvStr)
        if !reflect.DeepEqual(expectedMap, gotMap) {
            t.Errorf("Abs(%s) = %v; want %v", kvStr, gotMap, expectedMap)
        }
    }
    test("keyword1=value1,keyword2=value2,keyword3=value3,value4,value5,keyword4=value6",
        map[string]string{ "keyword1": "value1", "keyword2": "value2", "keyword3": "value3,value4,value5", "keyword4": "value6" })
    test("keyword1=value1,keyword2=value2,keyword3=value3,value4,value5:value6,value7,value8,keyword4=value9",
        map[string]string{ "keyword1": "value1", "keyword2": "value2", "keyword3": "value3,value4,value5:value6,value7,value8", "keyword4": "value9" })
}