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Regular Expressions
[25%] Identifier names in a hypothetical language may contain letters (A - Z and...
1) One of functionalities of a compiler is to determine if variable names are correct. Here...
1) One of functionalities of a compiler is to determine if variable names are correct. Here is the variable naming convention of Java programming language. “Variable names are case-sensitive. A variable's name can be any legal identifier — an unlimited-length sequence of Unicode letters and digits, beginning with a letter, the dollar sign "$", or the underscore character "_". White space is not permitted. Subsequent characters may be letters, digits, dollar signs, or underscore characters.” Also, you can assume that...
The phrase regular expressions, also called regexes, is often used to mean the specific, standard textual...
The phrase regular expressions, also called regexes, is often used to mean the specific, standard textual syntax for representing patterns for matching text, as distinct from the mathematical notation described below. Each character in a regular expression (that is, each character in the string describing its pattern) is either a metacharacter, having a special meaning, or a regular character that has a literal meaning. For example, in the regex a., a is a literal character which matches just 'a', while...
Please Do it In Java: Objectives: To Java programming language To understand the lexical analysis phase...
Please Do it In Java: Objectives: To Java programming language To understand the lexical analysis phase of program compilation Assignment: The first phase of compilation is called scanning or lexical analysis. This phase interprets the input program as a sequence of characters and produces a sequence of tokens, which will be used by the parser. Write a Java, program that implements a simple scanner for a source file given as a command-line argument. The format of the tokens is described...
Preliminaries For this lab you will be working with regular expressions in Python. Various functions for...
Preliminaries For this lab you will be working with regular expressions in Python. Various functions for working with regular expressions are available in the re module. Fortunately, Python makes it pretty easy to check if a string matches a particular pattern. At the top of the file we must import the re module: import re Then we can use the search() function to test whether a string matches a pattern. In the example below, the regular expression has been saved...
please Answer the following regular expressions questions(also do number 9) Q4 Choose the pattern that finds...
please Answer the following regular expressions questions(also do number 9) Q4 Choose the pattern that finds all filenames in which the first letters of the filename are astA, followed by a digit, followed by the file extension .txt. 1) astA[[:digit:]]\.txt 2) astA[[0-9]].txt 3) astA.\.txt 4) astA[[:digit:]].txt Q5 What's the difference between [0-z]+ and \w+ ? 1) The first one accepts 0 and z and the other doesn't. 2) The first one doesn't allow for uppercase letters. 3) The first one...
JAVA: Run length encoding is a simple form of data compression. It replaces long sequences of...
JAVA:
Run length encoding is a simple form of data compression. It
replaces long sequences of a repeated value with one occurrence of
the value and a count of how many times to repeat it. This works
reasonably well when there are lots of long repeats such as in
black and white images. To avoid having to represent non-repeated
runs with a count of 1 and the value, a special value is often used
to indicate a run and everything...
The last 3 cases are tests .cpp files to test the code. The language of this...
The last 3 cases are tests .cpp files to test the code. The
language of this code must be C++ because that is the only I am
familiar with.
Soreland, a software company, is planning on releasing its first C++ compiler with the hopes of putting MiniSoft's Visual C++ out of business (that reminds me of another story). Consequently, Soreland has contracted with the Fruugle Corporation to design and build part of their compiler. Of course, since Fruugle gets all...
The second phase of your semester project is to write pass one of a two‑pass assembler...
The second phase of your semester project is to write pass one of a two‑pass assembler for the SIC assembler language program. As with Phase 1, this is to be written in C (not C++) and must run successfully on Linux. Pass one will read each line of the source file, and begin the process of translating it to object code. (Note: it will be to your advantage to have a separate procedure handle reading, and perhaps tokenizing, the source...
Two words or phrases in English are anagrams if their letters (and only their letters), rearranged,...
Two words or phrases in English are anagrams if their letters (and only their letters), rearranged, are the same. We assume that upper and lower case are indistinguishable, and punctuation and spaces don't count. Two phrases are anagrams if they contain exactly the same number of exactly the same letters, e.g., 3 A's, 0 B's, 2 C's, and so forth. Some examples and non-examples of regular anagrams: * The eyes / they see (yes) * moo / mo (no) *...
You shall develop a grammar and implement a parser which recognizes valid statements as described below in the assignment specification. You may develop your code using C, C++. The test file include...
You shall develop a grammar and implement a parser which
recognizes valid statements as described below in the assignment
specification. You may develop your code using C, C++.
The test file include these expressions below. The first
six should pass and the rest should fail:
first = one1 + two2 - three3 / four4 ;
second = one1 * (two2 * three3) ;
second = one1 * (two2 * three3) ;
third = ONE + twenty - three3 ;
third...
JAVA:
Run length encoding is a simple form of data compression. It
replaces long sequences of a repeated value with one occurrence of
the value and a count of how many times to repeat it. This works
reasonably well when there are lots of long repeats such as in
black and white images. To avoid having to represent non-repeated
runs with a count of 1 and the value, a special value is often used
to indicate a run and everything...
The last 3 cases are tests .cpp files to test the code. The
language of this code must be C++ because that is the only I am
familiar with.
Soreland, a software company, is planning on releasing its first C++ compiler with the hopes of putting MiniSoft's Visual C++ out of business (that reminds me of another story). Consequently, Soreland has contracted with the Fruugle Corporation to design and build part of their compiler. Of course, since Fruugle gets all...
You shall develop a grammar and implement a parser which
recognizes valid statements as described below in the assignment
specification. You may develop your code using C, C++.
The test file include these expressions below. The first
six should pass and the rest should fail:
first = one1 + two2 - three3 / four4 ;
second = one1 * (two2 * three3) ;
second = one1 * (two2 * three3) ;
third = ONE + twenty - three3 ;
third...
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