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I am trying to use a regex to rename few files following this post

Renaming files using regular expressions - Linux

There are my files -

abcd_some_random_alphanumeric_1.pdf
abcd_some_random_alphanumeric_2.pdf
abcd_some_random_alphanumeric_3.pdf
abcd_some_random_alphanumeric_4.pdf
abcd_some_random_alphanumeric_5.pdf
I would like to rename the files to 
abcd_1.pdf
abcd_2.pdf 
abcd_3.pdf 
abcd_4.pdf 
abcd_5.pdf 
I am trying the following
rename 's/abcd_.*_(/d+).pdf/abcd_${1}.pdf/' *.pdf
But I get lots of errors - 
Unknown regexp modifier "/a" at (user-supplied code), near ""
Unknown regexp modifier "/b" at (user-supplied code), near "{
#line 1
Unknown regexp modifier "/c" at (user-supplied code), near "{
#line 1
...........
However, I want the _1, _2, _3 etc in the end.. and I dont know how to capture data using a regular expression from the original string and put the captured group in the replace part.
                There's a warning there, in bold letters: "There are other tools with the same name which may or may not be able to do this, so be careful." Indeed, man7.org/linux/man-pages/man1/rename.1.html shows a completely different utility. Check the manpage/help text for yours.
– ivan_pozdeev
                Jun 2, 2018 at 8:19
Your syntax is off, and a single digit in regex is \d, with a backslash not forward slash.  Also the dot in the extension .pdf should be escaped.  Try this:
rename 's/abcd_.*_(\d+)\.pdf/abcd_$1.pdf/' *.pdf
        
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