[정규식] 해시태그(#) 뽑아내기

해시태그를 뽑아 오는 정규식입니다.

<?php
$data = "가나다 #다라마 ABC #QWE 오오오오오오오오 #MINTSTATE  #ㅊㅊㅊㅊ BBS";
preg_match_all("/\\#([0-9a-zA-Z가-힣]*)/", $data, $hashtags);
print_r($hashtags);
?>

결과
Array ( [0] => Array ( [0] => #다라마 [1] => #QWE [2] => #MINTSTATE [3] => #ㅊㅊㅊㅊ ) [1] => Array ( [0] => 다라마 [1] => QWE [2] => MINTSTATE [3] => ㅊㅊㅊㅊ ) )



* 추가
https://saikyo4713.blog.me/221023839399

<?php
//본문에서 해시태그 변환
function string_to_hashtag_content($os_type, $string)
{
    try
    {
        if(in_array($os_type, ['A', 'I', 'W']) && $string)
        {
            $result = array();
            $re_all = "/(^|\s)*#(.+?)(?=[\s,#)]|$)/";
            $re = "/[ #\&\+\-%@=\/\\\:;,\.'\"\^`~\_|\!\?\*$#<>()\[\]\{\}]/i";
            preg_match_all($re_all, $string, $matches);
            foreach($matches[0] as $s)
            {
                $str = strip_tags(trim($s));
                $str = substr($str, 1, strlen($str)-1);
                //특수문자 대체
                if(!preg_match($re, $str))
                {
                    $str = string_to_replace($str);
                    if(strlen($str) > 1)
                    {
                        switch($os_type)
                        {
                            case "A" : $result["#" . $str] = "<a href='javascript:alert(\"" . $str . "\")'>#" . $str . "</a>"; break;
                            case "I" : $result["#" . $str] = "<a href='javascript:alert(\"" . $str . "\")'>#" . $str . "</a>"; break;
                            default : break;
                        }
                    }
                }
            }
            return strtr($string, $result) . '';
        } else throw new Exception ('');
    } catch (Exception $e) {
        return $e->getMessage();
    }
}

//본문에서 해시태그 추출 (배열)
function string_to_hashtag_db($string)
{
    try
    {
        if($string)
        {
            $result = array();
            $re_all = "/(^|\s)*#(.+?)(?=[\s,#)]|$)/";
            $re = "/[ #\&\+\-%@=\/\\\:;,\.'\"\^`~\_|\!\?\*$#<>()\[\]\{\}]/i";
            preg_match_all($re_all, $string, $matches);
            foreach($matches[0] as $s)
            {
                $str = strip_tags(trim($s));
                $str = substr($str, 1, strlen($str)-1);
                if(!preg_match($re, $str))
                {
                    $str = string_to_replace($str);
                    if(strlen($str) > 1) $result[] = $str;
                }
            }
            return array_unique($result);
        } else throw new Exception ('');
    } catch (Exception $e) {
        return array();
    }
}

//본문내용 해시태그 변환 (본문 저장용으로 사용가능)
function string_to_hashtag($mode, $string)
{
    $change = array();
    preg_match_all("/(^|\s)*#(.+?)(?=[\s,#)]|$)/", $string, $matches);
    foreach ( $matches[0] as $s )
    {
        $str = strip_tags(trim($s));
        $str = substr($str, 1, strlen($str)-1);
        //특수문자 대체
        if(!preg_match("/[ #\&\+\-%@=\/\\\:;,\.'\"\^`~\_|\!\?\*$#<>()\[\]\{\}]/i", $str))
        {
            $str = string_to_replace($str);
            if(strlen($str) > 1) $change["#" . $str] = "<TAG>#".$str."</TAG>";
        }
    }
    return strtr($string, $change).'';
}

//본문내용 해시태그 표기 (본문 저장용으로 사용가능)
function hashtag_to_string($mode, $string)
{
    $change = array();
    preg_match_all("/<TAG>(.*?)<\/TAG>/", $string, $matches);
    foreach ( $matches[0] as $s )
    {
        $str = strip_tags($s);
        switch($mode)
        {
            case "A" : $change[$str] = "<a href='javascript:alert(\"" . $str . "\")'>" . $str . "</a>"; break;
            case "I" : $change[$str] = "<a href='javascript:alert(\"" . $str . "\")'>" . $str . "</a>"; break;
            case "W" : $change[$str] = "<a href='javascript:alert(\"" . $str . "\")'>" . $str . "</a>"; break;
        }
    }
    return strtr($string, $change).'';
}


function string_to_replace($str) {
	return $str;
}
?>