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7.2 Manipulating strings
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1. Slice strings and get sub-strings out of them
* Check whether a particular string is valid for the given list(0.45 - 3.00)
* Exercise 1: Obtain a sub-string excluding the first and last characters
from the string s(3.08 - 4.10)
#. Reverse strings.
* Finding out, if a given string is palindromic or not(4.11 - 5.24)
#.Convert strings to upper or lower case.
* Converting a string to lower/upper case(5.25 - 6.49)
* Exercise 2: Combined exercise of sub-string and converting strings to upper/lower case(6.56 - 8.01)
#. Replace characters in strings.
* Example of replacing special characters in strings(8.02 - 9.18)
* Exercise 3: Replace the ``[dot]`` with ``.``(9.27 - 10.06)
#. Join a list of strings
* Example showing how to obtain one long string of e-mail addresses separated
by commas or semi-colons from a list of e-mail addresses(10.07 - 11.32)
* Exercise 4: Change the seperator from a given string(11.39 - 12.29)
#. Summary(12.33 - 12.54)
#. Evaluation Questions(12.56 - 14.10)
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