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This homework assignment requires the knowledge from Module 3.
 
This homework assignment requires the knowledge from Module 3.
  
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=== Please write a regular expression for matching the sequence of hexadecimal numbers which follows these rules: ===
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==== Please write a regular expression for matching the sequence of numbers which follows these rules: ====
  
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1) The sequence consists of one or more parts. If there are two or more parts, they are separated with a comma (",") character.
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* The sequence consists of one or more parts. If there are two or more parts, they are separated with a comma (",") character.
  
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2) Each part of the sequence is a non-zero hexadecimal number which must contain the following characters only: 0 1 2 3 4 5 6 7 8 9 A B C D E F a b c d e f. Each hexadecimal number must consist of odd number of hexadecimal digits and must not begin with 0 (for example, 2A1, 10276, 71EA17C, 500A48390, etc.). Also, each hexadecimal number may be prefixed by an optional minus ("-") sign.
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* Each part of the sequence is either an integer or a real number. An integer number consists of one or more digits and must not begin with zero ("0"), unless the integer number has only one digit. If the part of the sequence is a real number, it consists of one or more digits which are followed by one dot (".") character, with this dot character being followed by one or more digits. Like the integer number, the real number must not begin with zero ("0"), unless there is only one digit before the dot character. Also, the real number must not end with zero ("0"), unless there is only one digit after the dot character.
  
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Please note that for accomplishing the task, one regular expression has to be submitted which is '''suitable for use with the egrep or pcregrep tool'''. It is not acceptable to submit the solution in a fragmented way (e.g., several isolated expressions for addressing different parts of the task). Also, it is not allowed to submit programs in Java, Python, Perl (or any other language) for the solution. Finally, if the solution '''only works with the examples provided below but does NOT meet the task specification''', it will be treated as '''incorrect'''.
 
  
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Please note that for accomplishing the task, '''one regular expression''' has to be submitted which is '''suitable for use with the egrep or pcre2grep tool'''.
 +
It is not acceptable to submit the solution in a fragmented way (e.g.,several isolated expressions for addressing different parts of the task).
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Also, it is not allowed to submit programs in Java, Python, Perl (or any other language) for the solution.
  
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=== Examples of sequences the regular expression must match: ===
 
  
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1234567 (the sequence has one valid hexadecimal number)
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==== Examples of sequences the regular expression must match: ====
  
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9A150,F3D50C3 (the sequence has two valid parts)  
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12345                (the sequence has one valid integer part)
  
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B125022,-174FF (the sequence has two valid parts, with the second hexadecimal having a minus sign)  
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915,2.35            (the sequence has two valid parts - an integer
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                      and a real number)
  
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-281,-A2E17,201 (the sequence has three valid parts, with the first and second hexadecimals having a minus sign)  
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1.205,754.0          (the sequence has two valid real number parts)
  
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C,1,3,41D8C,1,A,-71A,-180 (the sequence has eight valid parts)  
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8.4,12,0.1           (the sequence has three valid parts - a real number,
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                      integer, and a real number)
  
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1,1.0,3,4.8,0.0,0,7.001,8.0      (the sequence has eight valid parts)
  
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=== Examples of sequences the regular expression must NOT match: ===
 
  
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110, 220 (the second part begins with a space character which is illegal)
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==== Examples of sequences the regular expression must NOT match: ====
  
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1A 2,337 (the first part contains a space character which is illegal)  
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1, 2         (the second part begins with a space character which is illegal)
  
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9A1, (the first part ends with comma, but there is no following second part)  
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1 2,3        (the first part contains a space character which is illegal)
  
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1G9A2 (the number contains an illegal character G)  
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9.0,          (the first part ends with comma, but there is no
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                following second part)
  
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-09A (the number starts with a 0)  
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9F            (the number contains an illegal character F)
  
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--F (the number begins with two minus signs, but only one sign is allowed)  
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02            (the integer number has more than one digit and begins with  
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                a zero which is illegal)
  
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12-1 (the minus sign illegally appears in the middle of a number)  
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2.00          (the real number has more than one digit after the dot character
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                and ends with a zero which is illegal)
  
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172,,189 (the second part of the sequence is empty)  
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2-1          (the number contains an illegal character -)
  
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121,-AB,D84 (the second part does not consist of odd number of hexadecimal digits)  
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2,,8.9        (the second part of the sequence is empty)
  
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P$121,4D3,B22 (the sequence begins with illegal characters)  
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2.            (the real number contains a dot character without at least
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                one following digit)
  
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B2C,312+T (the sequence ends with illegal characters)
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.3            (the real number contains a dot character without at least
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                one preceding digit)
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1.43.222      (the real number illegally contains two dot characters)

Viimane redaktsioon: 26. september 2023, kell 12:18

This homework assignment requires the knowledge from Module 3.

Please write a regular expression for matching the sequence of numbers which follows these rules:

  • The sequence consists of one or more parts. If there are two or more parts, they are separated with a comma (",") character.
  • Each part of the sequence is either an integer or a real number. An integer number consists of one or more digits and must not begin with zero ("0"), unless the integer number has only one digit. If the part of the sequence is a real number, it consists of one or more digits which are followed by one dot (".") character, with this dot character being followed by one or more digits. Like the integer number, the real number must not begin with zero ("0"), unless there is only one digit before the dot character. Also, the real number must not end with zero ("0"), unless there is only one digit after the dot character.


Please note that for accomplishing the task, one regular expression has to be submitted which is suitable for use with the egrep or pcre2grep tool. It is not acceptable to submit the solution in a fragmented way (e.g.,several isolated expressions for addressing different parts of the task). Also, it is not allowed to submit programs in Java, Python, Perl (or any other language) for the solution.


Examples of sequences the regular expression must match:

12345                (the sequence has one valid integer part)

915,2.35             (the sequence has two valid parts - an integer 
                      and a real number)

1.205,754.0          (the sequence has two valid real number parts)

8.4,12,0.1           (the sequence has three valid parts - a real number, 
                      integer, and a real number)

1,1.0,3,4.8,0.0,0,7.001,8.0      (the sequence has eight valid parts)


Examples of sequences the regular expression must NOT match:

1, 2          (the second part begins with a space character which is illegal)

1 2,3         (the first part contains a space character which is illegal)

9.0,          (the first part ends with comma, but there is no
               following second part)

9F            (the number contains an illegal character F)

02            (the integer number has more than one digit and begins with 
               a zero which is illegal)

2.00          (the real number has more than one digit after the dot character 
               and ends with a zero which is illegal)

2-1           (the number contains an illegal character -)

2,,8.9        (the second part of the sequence is empty)

2.            (the real number contains a dot character without at least
               one following digit)

.3            (the real number contains a dot character without at least
               one preceding digit)

1.43.222      (the real number illegally contains two dot characters)
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