Modified replace operation to use regexes in caddyfile

modules/caddyhttp/rewrite/caddyfile.go

@@ -214,7 +214,7 @@ func applyQueryOps(h httpcaddyfile.Helper, qo *queryOps, args []string) error {
 		qo.Rename = append(qo.Rename, queryOpsArguments{Key: renameValKey[0], Val: renameValKey[1]})
 
 	case len(args) == 3:
-		qo.Replace = append(qo.Replace, queryOpsReplacement{Key: key, Search: args[1], Replace: args[2]})
+		qo.Replace = append(qo.Replace, &queryOpsReplacement{Key: key, SearchRegexp: args[1], Replace: args[2]})
 
 	default:
 		if len(args) != 2 {

modules/caddyhttp/rewrite/rewrite.go

@@ -118,6 +118,12 @@ func (rewr *Rewrite) Provision(ctx caddy.Context) error {
 		rep.re = re
 	}
 
+	for _, replacementOp := range rewr.Query.Replace {
+		err := replacementOp.Provision(ctx)
+		if err != nil {
+			return fmt.Errorf("compiling regular expression %s in query rewrite replace operation: %v", replacementOp.SearchRegexp, err)
+		}
+	}
 	return nil
 }
 
@@ -491,15 +497,26 @@ type queryOps struct {
 	Add []queryOpsArguments `json:"add,omitempty"`
 
 	// Replaces query parameters.
-	Replace []queryOpsReplacement
+	Replace []*queryOpsReplacement
 
 	// Deletes a given query key by name.
 	Delete []string `json:"delete,omitempty"`
 }
 
+// Provision compiles the query replace operation regex.
+func (replacement *queryOpsReplacement) Provision(_ caddy.Context) error {
+	if replacement.SearchRegexp != "" {
+		re, err := regexp.Compile(replacement.SearchRegexp)
+		if err != nil {
+			return fmt.Errorf("replacement for query field '%s': %v", replacement.Key, err)
+		}
+		replacement.re = re
+	}
+	return nil
+}
+
 func (q *queryOps) do(r *http.Request, repl *caddy.Replacer) {
 	query := r.URL.Query()
-
 	for _, renameParam := range q.Rename {
 		key := repl.ReplaceAll(renameParam.Key, "")
 		val := repl.ReplaceAll(renameParam.Val, "")