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

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Regular Expressions in JavaScript:

venereology answered 10 months ago

For each of the following Perl regular expressions, give a complete and precise description of the...

For each of the following Perl regular expressions, give a complete and precise description of the function of the regular expression, plus a related example string: (a) /"([^"]*)"/ (b) /[-+]?\d+(\.\d*)?F\b/ (c) /(\D{2,}).*\[\1\]/ (d) /((.*?)\d)\s\2/ (e) /^[0-9]+\/\d+([+\-*\/]\=|([+]{2}|[-]{2}));$/

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...

Give a high-level description of a TM (how it moves its head around, etc.) that takes...

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...

5 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.

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

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