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// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.
package model
import (
"regexp"
"strings"
)
var atMentionRegexp = regexp.MustCompile(`\B@[[:alnum:]][[:alnum:]\.\-_]*`)
const usernameSpecialChars = ".-_"
// PossibleAtMentions returns all substrings in message that look like valid @
// mentions.
func PossibleAtMentions(message string) []string {
var names []string
if !strings.Contains(message, "@") {
return names
}
alreadyMentioned := make(map[string]bool)
for _, match := range atMentionRegexp.FindAllString(message, -1) {
name := NormalizeUsername(match[1:])
if !alreadyMentioned[name] && IsValidUsername(name) {
names = append(names, name)
alreadyMentioned[name] = true
}
}
return names
}
// TrimUsernameSpecialChar tries to remove the last character from word if it
// is a special character for usernames (dot, dash or underscore). If not, it
// returns the same string.
func TrimUsernameSpecialChar(word string) (string, bool) {
len := len(word)
if len > 0 && strings.LastIndexAny(word, usernameSpecialChars) == (len-1) {
return word[:len-1], true
}
return word, false
}
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