﻿ Python: Find the substrings within a string - w3resource

# Python: Find the substrings within a string

## Python Regular Expression: Exercise-21 with Solution

Write a Python program to find the substrings within a string.

Sample text:
'Python exercises, PHP exercises, C# exercises'
Pattern:
'exercises'

Note: There are two instances of exercises in the input string.

Sample Solution:-

Python Code:

``````import re
text = 'Python exercises, PHP exercises, C# exercises'
pattern = 'exercises'
for match in re.findall(pattern, text):
print('Found "%s"' % match)
```
```

Sample Output:

```Found "exercises"
Found "exercises"
Found "exercises"
```

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Flowchart:

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## Python: Tips of the Day

Getting the last element of a list:

some_list[-1] is the shortest and most Pythonic.

In fact, you can do much more with this syntax. The some_list[-n] syntax gets the nth-to-last element. So some_list[-1] gets the last element, some_list[-2] gets the second to last, etc, all the way down to some_list[-len(some_list)], which gives you the first element.

You can also set list elements in this way. For instance:

```>>> some_list = [1, 2, 3]
>>> some_list[-1] = 5 # Set the last element
>>> some_list[-2] = 3 # Set the second to last element
>>> some_list
[1, 3, 5]
```

Note that getting a list item by index will raise an IndexError if the expected item doesn't exist. This means that some_list[-1] will raise an exception if some_list is empty, because an empty list can't have a last element.

Ref: https://bit.ly/3d8TfFP