Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/platform/services/searchengine/utils.go

@@ -0,0 +1,44 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package searchengine
+
+import (
+	"regexp"
+	"strings"
+
+	"github.com/mattermost/mattermost-server/v6/server/channels/utils"
+)
+
+var EmailRegex = regexp.MustCompile(`^[^\s"]+@[^\s"]+$`)
+
+func GetSuggestionInputsSplitBy(term, splitStr string) []string {
+	splitTerm := strings.Split(strings.ToLower(term), splitStr)
+	var initialSuggestionList []string
+	for i := range splitTerm {
+		initialSuggestionList = append(initialSuggestionList, strings.Join(splitTerm[i:], splitStr))
+	}
+
+	suggestionList := []string{}
+	// If splitStr is not an empty space, we create a suggestion with it at the beginning
+	if splitStr == " " {
+		suggestionList = initialSuggestionList
+	} else {
+		for i, suggestion := range initialSuggestionList {
+			if i == 0 {
+				suggestionList = append(suggestionList, suggestion)
+			} else {
+				suggestionList = append(suggestionList, splitStr+suggestion, suggestion)
+			}
+		}
+	}
+	return suggestionList
+}
+
+func GetSuggestionInputsSplitByMultiple(term string, splitStrs []string) []string {
+	suggestionList := []string{}
+	for _, splitStr := range splitStrs {
+		suggestionList = append(suggestionList, GetSuggestionInputsSplitBy(term, splitStr)...)
+	}
+	return utils.RemoveDuplicatesFromStringArray(suggestionList)
+}