hemantshekhawat
/ php_valid_twitter_hashtag_regex.php
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August 29, 2015 14:21
— forked from janogarcia/php_valid_twitter_hashtag_regex.php
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| <?php | |
| /** | |
| * PHP Regex to validate a Twitter hashtag | |
| * | |
| * Useful for validating a text input (an HTML form in your CMS or custom application) that must be a valid Twitter hashtag. | |
| * Valid examples: #a, #_, #_1, #_a, #1a, #áéìôü, #123hàsh_täg446 | |
| * Invalid examples: #1, ##hashtag, #hash-tag, #hash.tag, #hash tag, #hashtag!, (any hashtag that is more than 140 characters long, hash symbol included) | |
| * | |
| * Regex explanation: | |
| * First, the lookahead assertion (?=.{2,140}$) checks the minimum and max length, as explained here http://stackoverflow.com/a/4223213/1441613 |
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