[Solved] Add html after variable

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A trivial regex that works unless > characters might occur somewhere within the <body> tag itself:

Search for <body[^>]*> and replace the match with $0<mynewtag>:

$result = preg_replace('/<body[^>]*>/', '$0<mynewtag>', $subject);

Test it live on regex101.com.

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solved Add html after variable