Please download the files words.txt and Assignment-Bash-regex.bash.

Your assignment is to modify "Assignment-Bash-regex.bash" to recognize words in the words.txt file matching five different regular expressions.

Please change the values of the variables named "regex1" through "regex5" so that each of those is an extended regular expression (i.e., it must use a regular expression with back references), and it must contain no single, fixed characters; use only character classes such as "\w" or "[:alpha:]" to refer to elements of the Latin alphabet. (I.e., you cannot write regex2 as regex2="^(r)(e)(d)\3\2\1$", although of course that does match the single six letter palindrome in the file.)

"regex1" should recognize these (and only these) five letter palindromes from words.txt:

     civic
     kayak
     level
     madam
     minim
     radar
     refer
     rotor
     sagas
     sexes
     shahs
     solos
     stats
     tenet

"regex2" should recognize this six letter palindrome from words.txt (and nothing else):

     redder

"regex3" should recognize this seven letter palindrome from words.txt (and nothing else):

     deified

"regex4" should recognize these words that contain at least two instances of the same doubled characters (and no other words); for example, "willfully" should be recognized since it has "ll" twice, and "riffraff" should be recognized since it contains "ff" twice:

     Boccaccio
     Chancellorsville
     Greensleeves
     Mississauga
     Mississippi
     Mississippian
     Mississippians
     Okeechobee
     Tweedledee
     aggressiveness
     aimlessness
     allegorically
     artlessness
     assassin
     assassinate
     assassinated
     assassinates
     assassinating
     assassination
     assassinations
     assassins
     assertiveness
     assess
     assessed
     assesses
     assessing
     assessment
     assessments
     assessor
     assessors
     assiduousness
     beekeeper
     beekeepers
     beekeeping
     blessedness
     blissfulness
     bossiness
     breathlessness
     carelessness
     cheerlessness
     childlessness
     classiness
     classless
     colloquially
     cookbook
     cookbooks
     crassness
     crisscross
     crisscrossed
     crisscrosses
     crisscrossing
     crossness
     dauntlessness
     dillydallied
     dillydallies
     dillydally
     dillydallying
     dispossess
     dispossessed
     dispossesses
     dispossessing
     dispossession
     dissoluteness
     dressiness
     elliptically
     endlessness
     expressionless
     expressiveness
     faithlessness
     fearlessness
     flibbertigibbet
     flibbertigibbets
     foolproof
     footloose
     footstool
     footstools
     formlessness
     freebee
     freebees
     freewheel
     freewheeled
     freewheeling
     freewheels
     fruitlessness
     fussiness
     glossiness
     gracelessness
     grossness
     harmlessness
     heartlessness
     heedlessness
     helplessness
     hillbillies
     hillbilly
     homelessness
     hoodoo
     hoodooed
     hoodooing
     hoodoos
     hopelessness
     humorlessness
     illegally
     illogically
     impressiveness
     intellectually
     joblessness
     lawlessness
     listlessness
     massiveness
     messiness
     mindlessness
     muumuu
     muumuus
     noiselessness
     parallelled
     parallelling
     passionless
     peewee
     peewees
     permissiveness
     pizzazz
     pointlessness
     possess
     possessed
     possesses
     possessing
     possession
     possessions
     possessive
     possessively
     possessiveness
     possessives
     possessor
     possessors
     powerlessness
     prepossess
     prepossessed
     prepossesses
     prepossessing
     prissiness
     reassess
     reassessed
     reassesses
     reassessing
     reassessment
     reassessments
     recklessness
     relentlessness
     remissness
     repossess
     repossessed
     repossesses
     repossessing
     repossession
     repossessions
     restlessness
     riffraff
     ruthlessness
     schoolbook
     schoolbooks
     schoolroom
     schoolrooms
     scuttlebutt
     selflessness
     senselessness
     shapelessness
     shiftlessness
     skillfully
     sleeplessness
     spotlessness
     squeegee
     squeegeed
     squeegeeing
     squeegees
     tactlessness
     tastelessness
     teepee
     teepees
     thoughtlessness
     timelessness
     tirelessness
     uselessness
     volleyball
     volleyballs
     voodoo
     voodooed
     voodooing
     voodooism
     voodoos
     weightlessness
     whippersnapper
     whippersnappers
     willfully
     worthlessness

"regex5" should recognize the following words that contain at least three instances of doubled characters (and no other words); "bookkeeper" should be recognized, since it has "oo", "kk", and "ee", and "keenness" should be recognized since it has "ee", "nn", and "ss".

     Chattahoochee
     Mississippi
     Mississippian
     Mississippians
     Tallahassee
     Tennessee
     addressee
     addressees
     aggressiveness
     barrenness
     bookkeeper
     bookkeepers
     bookkeeping
     cheerlessness
     committee
     committees
     greenness
     heedlessness
     keenness
     noncommittally
     possessiveness
     rottenness
     sleeplessness
     stubbornness
     subcommittee
     subcommittees
     successfully
     suddenness
     sullenness
     unsuccessfully
     whippoorwill
     whippoorwills
     woodenness
     woolliness

Please submit your Assignment-Bash-regex.bash file on Canvas by 11:59pm on Sunday, October 5 (you don't have to tar it up.)