$re = '/.*?<li.*?<a href="(\/release[^"]+)">([^<]+)<\/a>.*?<\/li>/s';
$str = ' <li class="bucket-item ec-item horz-release" data-ec-position="87"
data-ec-type="product"
data-ec-name="Perfect Storm"
data-ec-creative="Label - Releases"
data-ec-brand="Interplay Global"
data-ec-category="Releases"
data-ec-list="Label - Releases"
data-ec-price="1.29"
data-ec-d1="David Deere, Brandon Mignacca">
<div class="horz-release-artwork-parent">
<a href="/release/perfect-storm/3265557">
<img class="horz-release-artwork lazy-load" src="https://geo-pro.beatport.com/static/60b2f914842e8b09024754e8a6493b36.png" data-src="https://geo-media.beatport.com/image_size/250x250/cd9e7e36-d598-45c2-a05c-d2e286a0bcb1.jpg" />
</a>
</div>
<div class="horz-release-meta-parent">
<div class="horz-release-meta">
<p class="buk-horz-release-title"><a href="/release/perfect-storm/3265557">Perfect Storm</a></p>
<p class="buk-horz-release-artists">
<a href="/artist/david-deere/31534" data-artist="31534">David Deere</a>,
<a href="/artist/brandon-mignacca/523042" data-artist="523042">Brandon Mignacca</a>
</p>
<p class="buk-horz-release-labels">
<a href="/label/interplay-global/93385" data-label="93385">Interplay Global</a></p>
<p class="buk-horz-release-released">2021-02-12</p>
</div>
<div class="horz-release-actions-parent">
<div class="horz-release-actions">
<div class="horz-release-play-queue">
<button class="playable-play" data-type="release" data-id="3265557" data-track="14824920">
<svg viewBox="0 0 200 200" class="play-icon">
<use xlink:href="/static/4fef40cebd6b915bcbe9695d5d543a01.svg#icon-play"></use>
</svg>
</button>
<button class="playable-queue tooltip-secondary" data-type="release" data-id="3265557" data-track="14824920">
<svg viewBox="0 0 16 11" class="queue-icon">
<use xlink:href="/static/4fef40cebd6b915bcbe9695d5d543a01.svg#icon-add-queue"></use>
</svg>
<span class="tooltiptext">Add to queue</span>
</button>
</div>
<div class="buy-button horz-release-buy-button
" data-release="3265557" data-price="$1.29" >
<button class="add-to-default">$1.29</button>
<button class="launch-menu">
<div class="launch-menu-icon">
<svg viewBox="0 0 200 200" class="icon">
<use xlink:href="/static/4fef40cebd6b915bcbe9695d5d543a01.svg#icon-chevron-down"></use>
</svg>
</div>
<div class="loading-menu-icon">
<div class="icon"></div>
</div>
</button>
</div>
</div>
<a href="#" class="icon icon-ellipsis horz-release-ellipsis mobile-action"></a>
</div>
</div>
</li>
<li class="bucket-item ec-item horz-release" data-ec-position="88"
data-ec-type="product"
data-ec-name="Glasshouse"
data-ec-creative="Label - Releases"
data-ec-brand="Interplay Global"
data-ec-category="Releases"
data-ec-list="Label - Releases"
data-ec-price="1.29"
data-ec-variant="album"
data-ec-id="3265543"
data-ec-d1="Hiski, Milad E">
<div class="horz-release-artwork-parent">
<a href="/release/glasshouse/3265543">
<img class="horz-release-artwork lazy-load" src="https://geo-pro.beatport.com/static/60b2f914842e8b09024754e8a6493b36.png" data-src="https://geo-media.beatport.com/image_size/250x250/d45916cd-e96a-4669-9cd1-d71b28c21258.jpg" />
</a>
</div>
<div class="horz-release-meta-parent">
<div class="horz-release-meta">
<p class="buk-horz-release-title"><a href="/release/glasshouse/3265543">Glasshouse</a></p>
<p class="buk-horz-release-artists">
<a href="/artist/hiski/574515" data-artist="574515">Hiski</a>,
<a href="/artist/milad-e/581122" data-artist="581122">Milad E</a>
</p>
<p class="buk-horz-release-labels">
<a href="/label/interplay-global/93385" data-label="93385">Interplay Global</a></p>
<p class="buk-horz-release-released">2021-02-05</p>
</div>
<div class="horz-release-actions-parent">
<div class="horz-release-actions">
<div class="horz-release-play-queue">
<button class="playable-play" data-type="release" data-id="3265543" data-track="14824888">
<svg viewBox="0 0 200 200" class="play-icon">
<use xlink:href="/static/4fef40cebd6b915bcbe9695d5d543a01.svg#icon-play"></use>
</svg>
</button>
<button class="playable-queue tooltip-secondary" data-type="release" data-id="3265543" data-track="14824888">
<svg viewBox="0 0 16 11" class="queue-icon">
<use xlink:href="/static/4fef40cebd6b915bcbe9695d5d543a01.svg#icon-add-queue"></use>
</svg>
<span class="tooltiptext">Add to queue</span>
</button>
</div>
<div class="buy-button horz-release-buy-button
" data-release="3265543" data-price="$1.29" >
<button class="add-to-default">$1.29</button>
<button class="launch-menu">
<div class="launch-menu-icon">
<svg viewBox="0 0 200 200" class="icon">
<use xlink:href="/static/4fef40cebd6b915bcbe9695d5d543a01.svg#icon-chevron-down"></use>
</svg>
</div>
<div class="loading-menu-icon">
<div class="icon"></div>
</div>
</button>
</div>
</div>
<a href="#" class="icon icon-ellipsis horz-release-ellipsis mobile-action"></a>
</div>
</div>
</li>';
$subst = "$2 https://www.beatport.com$1\n";
$result = preg_replace($re, $subst, $str);
echo "The result of the substitution is ".$result;
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php