03-21-2017
1. an 2.
print for loops over all the matches by /\b(\d{23})\b/g
/\[(\d+)\]/ and print $1 means if there is a match then print the first match
3.
globally per line. And since this is done for every line, because of of the perl -lne command line options, this works out to be all matches..
4.
Because the boundary operators (\b) only work if there are non-word characters surrounding the digits, as explained in post #7 . So there is no match because the 23 digits are surrounded by word characters, so there is no word boundary.
Last edited by Scrutinizer; 03-21-2017 at 03:44 PM..
Reason: Added 4.
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