Give a high-level description of what regular expressions are, and how JavaScript uses them.

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Regular Expressions in JavaScript:

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Regular => Context-Free Give a proof by induction on regular expressions that: For any language A,...

Regular => Context-Free Give a proof by induction on regular expressions that: For any language A, if A is regular, then A is also context-free. You may assume that the statements from the previous Closure under Context-Free Languages problem are proved. R is a regular expression if RR is: a for some a∈alphabet Σ, the empty string ε, the empty set ∅, R1∪R2, sometimes written R1∣R2, where R1 and R2 are regular expressions, R1∘R2, sometimes written R1R2, where R1 and...

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Give a high-level description of a TM (how it moves its head around, etc.) that takes a string of the form x#y where x, y ∈ {a, b}* are guaranteed to have |x| = |y| ≥ 1, and swaps x and y (i.e., it should halt with y#x written on the tape). For example, if the input is abb#bab then the output should be bab#abb. Do not give a state diagram. Use the “marking” idea to keep track of where...

5 Regular => Context-Free Give a proof by induction on regular expressions that: For any language...

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Instructions: Using Unix programming language and regular expressions, 1. how many unique ip addresses were seen note: we only want to look at ipv4 addresses 2. which was most commnly seen ip address on the piece of access.log file below 66.249.75.132 - - [18/Jun/2018:06:41:00 -0500] "GET /~rcoleman/Common/History/Images/?C=N;O=D HTTP/1.1" 200 1976 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" 5.255.250.23 - - [18/Jun/2018:06:41:23 -0500] "GET /~rcoleman/Common/CodeVault/Code/DesignPatterns/Images/DP16-Builder.jpg HTTP/1.1" 304 182 "-" "Mozilla/5.0 (compatible; YandexImages/3.0; +http://yandex.com/bots)" 5.255.250.23 - - [18/Jun/2018:06:41:28 -0500] "GET /~rcoleman/CS121/CourseInfo/Images/WinExp.jpg HTTP/1.1" 304 180...

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