Support old browsers without RegExp lookbehind support - #396
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…gExp lookbehind support
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Replace the hashtag regex lookbehind (?<=\s|^) with (?:^|\s) and trim matches, so generateHashtags works on older iPhones/Safari where lookbehind throws a SyntaxError. Needed for my Nostr client Brezn . Behavior is unchanged on modern browsers.