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+# DJFZ 2020 laboratories 2
+
+## Upgrade repo
+
+First, please update your repo. There are new tasks.
+
+`git pull git@git.wmi.amu.edu.pl:filipg/djfz-2020.git`
+
+## Tasks to do on your own
+Tasks from section B and C - regular expressions. Deadline is till the end of November 22nd.
+
+Please do all B tasks. These are the same tasks as A, but differ in the solution method. This time please use regular expressions.
+When writing the solutions, please pay attention to the diffrence in complexity and execution time between regular expressions (B) and solutions based on basic mechanisms (A).
+
+Each of you is assigned exactly 4 C tasks (in total these tasks will constitute an "easy task" with
+section C, although you don't have to do them all).
+Note: which task falls to you depends on the student index number! The tasks are grouped into 4 blocks:
+- TaskC00-TaskC09 - the remainder from dividing by 10,
+- TaskC10-TaskC36 - the remainder from dividing by 27,
+- TaskC37-TaskC43 - the remainder from dividing by 7,
+- TaskC44-TaskC48 - the remainder from dividing by 5.
+
+Please check in the repository which task from each block is assigned to you. So each of you has exactly one task from each of these 4 blocks.
+
+You can get a total of 16 points for the second laboratory.
+
+
+## Regular expressions
+
+We will do regular expressions based on python3. Documentation: https://docs.python.org/3/library/re.html.
+
+### Basic functions
+
+search - returns the first match in the substring
+
+findall - returns a list of all matches (not overlapping)
+
+match - returns the match from the beginning of the string
+
+These are just the basic functions that we will use. The documentation describes them all.
+
+### match object
+
+```
+import re
+answer = re.search('na','banana')
+print(answer)
+print(answer.start())
+print(answer.end())
+print(answer.group())
+
+answer = re.search('na','kabanos')
+print(answer)
+type(answer)
+
+if answer:
+    print(answer.group())
+else:
+    pass
+```
+
+### Metacharacters
+
+ 
+- [] - set of characters
+- . - any sign
+
+- ^ - beginning of a string
+- $ - end of the a string
+
+- ? - the character preceding is or is not present
+- \* - zero or more appearances of the character preceding
+- \+ - one or more appearances of the character preceding
+- {} - exactly as many appearances of the character preceding
+
+- | - or
+- () - group
+- \ - escape character
+
+- \d a digit
+- \D every character, but digit
+- \s a whitespace
+- \S every character, but whitespace
+
+
+### Flags
+
+You can use special flags, such as in example:
+`re.search('ma', 'AlA Ma KoTa', re.IGNORECASE)`.
+
+### Examples (lab explanations)
+
+To study, it is better to use interactive python interpreter, preferably ipython.
+
+```
+import re
+
+text = 'Ala has a cat and hammock, and 150 bananas.
+
+re.search('ma',text)
+re.match('ma',text)
+re.match('Ala ma',text)
+re.findall('ma',text)
+
+re.findall('[mn]a',text)
+re.findall('[0-9]',text)
+re.findall('[0-9abc]',text)
+re.findall('[a-z][a-z]ma[a-z]',text)
+re.findall('[a-zA-Z][a-zA-Z]ma[a-zA-z0-9]',text)
+re.findall('\d',text)
+
+re.search('[0-9][0-9][0-9]',text)
+re.search('[\d][\d][\d]',text)
+
+re.search('\d{2}',text)
+re.search('\d{3}',text)
+
+re.search('\d+',text)
+
+re.search('\d+ bananas',text)
+re.search('\d* bananas', 'Ala has a lot of bananas')
+re.search('\d* bananas',text)
+re.search('ma \d? bananas','Ala has 5 bananas')
+re.search('ma ?d? bananas','Ala has bananas')
+re.search('ma(\d)? bananas', 'Ala has bananas') 
+
+re.search('\d+ bananas', 'Ala has 10 bananas or 20 bananas')
+re.search('\d+ bananas$', 'Ala has 10 bananas or 20 bananas')
+
+text = 'Ala has a cat and hammock, and 150 bananas.
+
+re.search('\d+ bananas',text)
+
+re.search('\d+\sbananów',text)
+
+re.search('kota . hamak',text)
+
+re.search('cat . hammock','Ala has a cat with a hammock')
+
+re.search('cat .* hammock','Ala has a cat or hammock')
+
+re.search('\.',text)
+
+re.search('cat|psa','Ala has a cat or hammock')
+
+re.findall('cat|psa','Ala has a cat or a dog')
+
+re.search('cat (i|or) dog','Ala has a cat or dog')
+
+re.search('mam (cat).*(cat|psa)','I have a cat. Ala has a dog.').group(0)
+
+re.search('mam (cat).*(cat|psa)','I have a cat. Ala has a dog.').group(1)
+
+re.search('mam (cat).*(cat|psa)','I have a cat. Ala has a dog.').group(2)
+```
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