feat: add DOMAIN-REGEX rule

rules/common/domain_regex.go

@@ -0,0 +1,42 @@
+package common
+
+import (
+	"regexp"
+	"strings"
+
+	C "github.com/metacubex/mihomo/constant"
+)
+
+type DomainRegex struct {
+	*Base
+	regex   string
+	adapter string
+}
+
+func (dr *DomainRegex) RuleType() C.RuleType {
+	return C.DomainRegex
+}
+
+func (dr *DomainRegex) Match(metadata *C.Metadata) (bool, string) {
+	domain := metadata.RuleHost()
+	match, _ := regexp.MatchString(dr.regex, domain)
+	return match, dr.adapter
+}
+
+func (dr *DomainRegex) Adapter() string {
+	return dr.adapter
+}
+
+func (dr *DomainRegex) Payload() string {
+	return dr.regex
+}
+
+func NewDomainRegex(regex string, adapter string) *DomainRegex {
+	return &DomainRegex{
+		Base:    &Base{},
+		regex:   strings.ToLower(regex),
+		adapter: adapter,
+	}
+}
+
+//var _ C.Rule = (*DomainRegex)(nil)