2 files changed, 48 insertions, 1 deletions
diff --git a/app/javascript/mastodon/utils/hashtags.js b/app/javascript/mastodon/utils/hashtags.js
new file mode 100644
index 000000000..358ce37f5
--- /dev/null
+++ b/app/javascript/mastodon/utils/hashtags.js
@@ -0,0 +1,47 @@
+const HASHTAG_SEPARATORS = '_\\u00b7\\u200c';
+const ALPHA = '\\p{L}\\p{M}';
+const WORD = '\\p{L}\\p{M}\\p{N}\\p{Pc}';
+
+const buildHashtagPatternRegex = () => {
+  try {
+    return new RegExp(
+      '(?:^|[^\\/\\)\\w])#((' +
+      '[' + WORD + '_]' +
+      '[' + WORD + HASHTAG_SEPARATORS + ']*' +
+      '[' + ALPHA + HASHTAG_SEPARATORS + ']' +
+      '[' + WORD + HASHTAG_SEPARATORS +']*' +
+      '[' + WORD + '_]' +
+      ')|(' +
+      '[' + WORD + '_]*' +
+      '[' + ALPHA + ']' +
+      '[' + WORD + '_]*' +
+      '))', 'iu',
+    );
+  } catch {
+    return /(?:^|[^/)\w])#(\w*[a-zA-Z·]\w*)/i;
+  }
+};
+
+const buildHashtagRegex = () => {
+  try {
+    return new RegExp(
+      '^((' +
+      '[' + WORD + '_]' +
+      '[' + WORD + HASHTAG_SEPARATORS + ']*' +
+      '[' + ALPHA + HASHTAG_SEPARATORS + ']' +
+      '[' + WORD + HASHTAG_SEPARATORS +']*' +
+      '[' + WORD + '_]' +
+      ')|(' +
+      '[' + WORD + '_]*' +
+      '[' + ALPHA + ']' +
+      '[' + WORD + '_]*' +
+      '))$', 'iu',
+    );
+  } catch {
+    return /^(\w*[a-zA-Z·]\w*)$/i;
+  }
+};
+
+export const HASHTAG_PATTERN_REGEX = buildHashtagPatternRegex();
+
+export const HASHTAG_REGEX = buildHashtagRegex();
diff --git a/app/javascript/mastodon/utils/notifications.js b/app/javascript/mastodon/utils/notifications.js
index 3cdf7caea..42623ac7c 100644
--- a/app/javascript/mastodon/utils/notifications.js
+++ b/app/javascript/mastodon/utils/notifications.js
@@ -3,7 +3,7 @@
 
 const checkNotificationPromise = () => {
   try {
-    // eslint-disable-next-line promise/catch-or-return, promise/valid-params
+    // eslint-disable-next-line promise/valid-params, promise/catch-or-return
     Notification.requestPermission().then();
   } catch(e) {
     return false;