$ perl -le'$_ = q/xxx12xxxx345xxxxx6789xxxx/; print; s/(?=\d+)/found/g
+; print'
xxx12xxxx345xxxxx6789xxxx
xxxfound12xxxxfound345xxxxxfound6789xxxx

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In reply to Re: inserting string using regular expression by jwkrahn
in thread inserting string using regular expression by MaxCarp

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