[Python] How to write find-all function (with regex) in awk or sed

I have bash function which run python (which return all found regex from stdin)

function find-all() {
python -c "import re
import sys
print '\n'.join(re.findall('$1', sys.stdin.read()))"
}


When I use this regex find-all 'href="([^"]*)"' < index.html it should return first group from the regex (value of href attribute from file index.html)

How can I write this in sed or awk?

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