I am required to type a regular expression within the pattern. What is the answer to this problem?

The logdata$.$txt file I am using is listed here:

$146\mathrm{.}204\mathrm{.}224\mathrm{.}152-$ feest$6811[21/$Jun$/2019$:$15$:$45$:$24-0700]$ "POST $/$incentivize HTTP$/1\mathrm{.}1"3024622$

$197\mathrm{.}109\mathrm{.}77\mathrm{.}178-$ kertzmann$3129[21/$Jun$/2019$:$15$:$45$:$25-0700]$ "DELETE $/$virtual$/$solutions$/$target$/$web$+$services HTTP$/2\mathrm{.}0"20326554$

$156\mathrm{.}127\mathrm{.}178\mathrm{.}177-$ okuneva$5222[21/$Jun$/2019$:$15$:$45$:$27-0700]$ "DELETE $/$interactive$/$transparent$/$niches$/$revolutionize HTTP$/1\mathrm{.}1"41614701$

$100\mathrm{.}32\mathrm{.}205\mathrm{.}59-$ ortiz$8891[21/$Jun$/2019$:$15$:$45$:$28-0700]$ "PATCH $/$architectures HTTP$/1\mathrm{.}0"2046048$

$168\mathrm{.}95\mathrm{.}156\mathrm{.}240-$ stark$2413[21/$Jun$/2019$:$15$:$45$:$31-0700]$ "GET $/$engage HTTP$/2\mathrm{.}0"2019645$

$71\mathrm{.}172\mathrm{.}239\mathrm{.}195-$ dooley$1853[21/$Jun$/2019$:$15$:$45$:$32-0700]$ "PUT $/$cutting$-$edge HTTP$/2\mathrm{.}0"40624498$

$180\mathrm{.}95\mathrm{.}121\mathrm{.}94-$ mohr$6893[21/$Jun$/2019$:$15$:$45$:$34-0700]$ "PATCH $/$extensible$/$reinvent HTTP$/1\mathrm{.}1"20127330$

$144\mathrm{.}23\mathrm{.}247\mathrm{.}108-$ auer$7552[21/$Jun$/2019$:$15$:$45$:$35-0700]$ "POST $/$extensible$/$infrastructures$/$one$-$to$-$one$/$enterprise HTTP$/1\mathrm{.}1"10022921$

$2\mathrm{.}179\mathrm{.}103\mathrm{.}97-$ lind$8584[21/$Jun$/2019$:$15$:$45$:$36-0700]$ "POST $/$grow$/$front$-$end$/$e$-$commerce$/$robust HTTP$/2\mathrm{.}0"30414641$

$241\mathrm{.}114\mathrm{.}184\mathrm{.}133-$ tromp$8355[21/$Jun$/2019$:$15$:$45$:$37-0700]$ "GET $/$redefine$/$orchestrate HTTP$/1\mathrm{.}0"20429059$

$224\mathrm{.}188\mathrm{.}38\mathrm{.}4-$ keebler$1423[21/$Jun$/2019$:$15$:$45$:$40-0700]$ "PUT $/$orchestrate$/$out$-$of$-$the$-$box$/$unleash$/$syndicate HTTP$/1\mathrm{.}1"40428211$

$94\mathrm{.}11\mathrm{.}36\mathrm{.}112-$ klein$8508[21/$Jun$/2019$:$15$:$45$:$41-0700]$ "POST $/$enhance$/$solutions$/$bricks$-$and$-$clicks HTTP$/1\mathrm{.}1"40424768$

$126\mathrm{.}196\mathrm{.}238\mathrm{.}197-$ gusikowski$9864[21/$Jun$/2019$:$15$:$45$:$45-0700]$ "DELETE $/$rich$/$reinvent HTTP$/2\mathrm{.}0"4057894$

$103\mathrm{.}247\mathrm{.}168\mathrm{.}212-$ medhurst$2732[21/$Jun$/2019$:$15$:$45$:$49-0700]$ "HEAD $/$scale$/$global$/$leverage HTTP$/1\mathrm{.}0"20315844$

$57\mathrm{.}86\mathrm{.}153\mathrm{.}68-$ dubuque$8645[21/$Jun$/2019$:$15$:$45$:$50-0700]$ "POST $/$innovative$/$roi$/$robust$/$systems HTTP$/1\mathrm{.}1"40629046$

$231\mathrm{.}220\mathrm{.}8\mathrm{.}214-$ luettgen$1860[21/$Jun$/2019$:$15$:$45$:$52-0700]$ "HEAD $/$systems$/$sexy HTTP$/1\mathrm{.}1"2012578$

$219\mathrm{.}133\mathrm{.}7\mathrm{.}154-$ price$5585[21/$Jun$/2019$:$15$:$45$:$53-0700]$ "GET $/$incubate$/$incubate HTTP$/1\mathrm{.}1"20112126$

$159\mathrm{.}252\mathrm{.}184\mathrm{.}44-$ fay$7852[21/$Jun$/2019$:$15$:$45$:$54-0700]$ "GET $/$convergence HTTP$/2\mathrm{.}0"40423856$

$40\mathrm{.}167\mathrm{.}172\mathrm{.}66-$ kshlerin$3090[21/$Jun$/2019$:$15$:$45$:$57-0700]$ "HEAD $/$convergence HTTP$/2\mathrm{.}0"50116287$

$167\mathrm{.}153\mathrm{.}239\mathrm{.}72-$ schaden$8853[21/$Jun$/2019$:$15$:$45$:$58-0700]$ "DELETE $/$bandwidth$/$reintermediate$/$engage HTTP$/2\mathrm{.}0"30217774$

$115\mathrm{.}214\mathrm{.}173\mathrm{.}248-$ hauck$8214[21/$Jun$/2019$:$15$:$46$:$00-0700]$ "PUT $/$optimize HTTP$/1\mathrm{.}1"40113160$

$21\mathrm{.}43\mathrm{.}188\mathrm{.}186-$ kunze$2653[21/$Jun$/2019$:$15$:$46$:$02-0700]$ "DELETE $/$bandwidth$/$turn$-$key$/$users HTTP$/2\mathrm{.}0"2012248$

$86\mathrm{.}187\mathrm{.}99\mathrm{.}249-$ tillman$6650[21/$Jun$/2019$:$15$:$46$:$03-0700]$ "POST $/$efficient$/$unleash HTTP$/1\mathrm{.}1"40522390$

$76\mathrm{.}72\mathrm{.}133\mathrm{.}93-$ carroll$1056[21/$Jun$/2019$:$15$:$46$:$05-0700]$ "POST $/$morph$/$optimize$/$plug$-$and$-$play HTTP$/2\mathrm{.}0"40027172$

$73\mathrm{.}162\mathrm{.}151\mathrm{.}229-$ dubuque