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mattstein / ee-extract-image-url

ExpressionEngine plugin that will pull an image URL out of a chunk of HTML (like a Wygwam or textarea field, for example).
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This plugin can make your life easier by grabbing an image URL out of a string. This is particularly useful for automatically generating feed thumbnails when combined with something that can manipulate images like CE Image.

{if '{exp:extract_image_url}{blog_body}{/exp:extract_image_url}' != ''}
    <p>image found: {exp:extract_image_url}{blog_body}{/exp:extract_image_url}</p>
{/if}