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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 keyword-value pairs 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 elements. If there are two or more elements, 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 element of the sequence is a keyword-value pair, where keyword and value are separated with an equal sign (=) character. Each keyword must be a sequence of one or more letters, while each value is a sequence of zero or more characters which are not double quotes ("). If the value is either empty or contains one or more non-digits, the value must be enclosed in double quotes ("). For non-empty values that consist of digits only, the surrounding double quotes may be omitted. Here are examples of valid keyword-value pairs:
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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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visitors=112
 
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temperature="12.3C"
 
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language="english"
 
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countries="US,UK,Germany,France"
 
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age=26
 
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year="1984"
 
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origin=""
 
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score="67.8"
 
  
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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). Also, it is not allowed to submit programs in Java, Python, Perl (or any other language) for the solution.
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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).
 +
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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speed="60kmph"  (the sequence has one valid element)
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==== Examples of sequences the regular expression must match: ====
  
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visitors=57,temp="36.4F",prefix="+372"  (the sequence has three valid elements)
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12345                (the sequence has one valid integer part)
  
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altitude="5000m",origin="",type="balloon",gas="oxygen",flammable="no",engines=0,heaters=1,crew=2   (the sequence has eight valid elements)
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915,2.35            (the sequence has two valid parts - an integer
 +
                      and a real number)
  
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Examples of sequences the regular expression must NOT match:
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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: ====
 +
 
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1, 2          (the second part begins with a space character which is illegal)
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 +
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
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                and ends with a zero which is illegal)
 +
 
 +
2-1          (the number contains an illegal character -)
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 +
2,,8.9        (the second part of the sequence is empty)
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 +
2.            (the real number contains a dot character without at least
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                one following digit)
 +
 
 +
.3            (the real number contains a dot character without at least
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                one preceding digit)
 +
 
 +
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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