Sed back referencing with Extended Regular Expressions

Answer #1 100 %

Back-referencing in BRE: \(pattern\) makes the sub-pattern and access with \n
Back-referencing in ERE: (pattern)makes the sub-pattern and access with \n

Your sed command in ERE:

sed -r 's#(www[0-9]*\.)[a-zA-Z0-9._]*(\.domain\.com[a-zA-Z0-9._/]*)#\1subtituted_text.\2#g'

Tags: regex bash url sed

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