regex - extracting chunk of string that matches regular expression using sed in unix -

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suppose have bunch of urls , each url contains unique identifier. looks 'abc1000002'. has same leading string, 'abc', , number digits different.

the identifier occurs in various positions in urls,

http://www.examle.com?abc1000002 http://www.example.com?abc1000002=blahblah#3fdslfkj

i can write regular expression like, 'abc[0-9][0-9][0-9][0-9][0-9][0-9]..[0-9], how write sed command extract chunk matches regular expression?

grep better tool job:

s='http://www.example.com/?abc1000002=blahblah#3fdslfkj' grep -eo 'abc[0-9]+' <<< "$s" abc1000002

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