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Regular Expression
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<iframe[\s]+?src="(http[s]*:\/\/)?www\.youtube\.com\/embed\/([a-zA-Z0-9-_]{11})[^"]*"[^>]*?><\/iframe>
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Input 1
1
New
<iframe src="https://www.youtube.com/embed/lfLRV19y6hg?disablekb=1&rel=0&showinfo=0" width="780" height="439" frameborder="0" allowfullscreen="allowfullscreen"></iframe> <iframe src="https://www.youtube.com/embed/3xzCyOdf4Qc?disablekb=1&rel=0&showinfo=0" width="780" height="439" frameborder="0" allowfullscreen="allowfullscreen"></iframe> <iframe src="https://www.youtube.com/embed/JtpT4LLxFv4?disablekb=1&rel=0&showinfo=0" width="780" height="440" frameborder="0" allowfullscreen="allowfullscreen"></iframe> <iframe src="https://www.youtube.com/embed/R6UAHzmxJ_g?disablekb=1&rel=0&showinfo=0" width="780" height="439" frameborder="0" allowfullscreen="allowfullscreen"></iframe> <iframe src="https://www.youtube.com/embed/DIFGObcX9A4?disablekb=1&rel=0&showinfo=0" width="780" height="439" frameborder="0" allowfullscreen="allowfullscreen"></iframe> <iframe src="https://www.youtube.com/embed/HtDEqzAk_48?disablekb=1&rel=0&showinfo=0" width="780" height="439" frameborder="0" allowfullscreen="allowfullscreen"></iframe> <iframe src="https://www.youtube.com/embed/n5GpN1Xa4q0?disablekb=1&rel=0&showinfo=0" width="780" height="439" frameborder="0" allowfullscreen="allowfullscreen"></iframe>
Substitution
<iframe src="https://www.youtube.com/embed/lfLRV19y6hg?disablekb=1&rel=0&showinfo=0" width="780" height="439" frameborder="0" allowfullscreen="allowfullscreen"></iframe> <iframe src="https://www.youtube.com/embed/3xzCyOdf4Qc?disablekb=1&rel=0&showinfo=0" width="780" height="439" frameborder="0" allowfullscreen="allowfullscreen"></iframe> <iframe src="https://www.youtube.com/embed/JtpT4LLxFv4?disablekb=1&rel=0&showinfo=0" width="780" height="440" frameborder="0" allowfullscreen="allowfullscreen"></iframe> <iframe src="https://www.youtube.com/embed/R6UAHzmxJ_g?disablekb=1&rel=0&showinfo=0" width="780" height="439" frameborder="0" allowfullscreen="allowfullscreen"></iframe> <iframe src="https://www.youtube.com/embed/DIFGObcX9A4?disablekb=1&rel=0&showinfo=0" width="780" height="439" frameborder="0" allowfullscreen="allowfullscreen"></iframe> <iframe src="https://www.youtube.com/embed/HtDEqzAk_48?disablekb=1&rel=0&showinfo=0" width="780" height="439" frameborder="0" allowfullscreen="allowfullscreen"></iframe> <iframe src="https://www.youtube.com/embed/n5GpN1Xa4q0?disablekb=1&rel=0&showinfo=0" width="780" height="439" frameborder="0" allowfullscreen="allowfullscreen"></iframe>