Regex match for HTML tag containing "on" JS trigger

I want to check if an HTML tag (potentially split across multiple lines) contains an "on" JS trigger. The actual HTML tag and the Javascript are of no consequence. For example:

    onblur="foo()"/>Other stuff

I've got most of this to work using the pattern:

    <\w+([^>])+?(on\w+)+[\s\S]+?>

However, this also matches:

    
Other stuff

I modified the original pattern to:

    <\w+([^>])+?(\s)+(on\w+)+[\s\S]+?>

but this matches only if the JS trigger keyword is preceded by 2 or more whitespace characters. A nudge in the right direction would be appreciated.

Answer

Might work <\w+(?=\s)[^>]*?\s(on\w+)[\s\S]+?>