Adding 0003-regex-findall.py

Author: oneananda

0003-Regular Expressions-findall/0003-regex-findall.py renamed to 0003-Regular Expressions- FindAll/0003-regex-findall.py

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+# 0003-regex-findall.py
+
+This script demonstrates the use of Python's `re.findall()` function to find all words in a given text that start with the letter "I".
+
+## Description
+The script imports the `re` module (Python's regular expressions module) and uses `re.findall()` with the pattern `\bI\w+` to find all words that begin with the capital letter "I".
+
+- `\b` asserts a word boundary, ensuring we only match words starting with "I".
+- `I` matches the literal capital letter "I".
+- `\w+` matches one or more word characters following "I".
+
+The script runs two examples to demonstrate the regex:
+
+1. Text: "The rain is happening in India"
+   - Expected output: `["India"]`
+
+2. Text: "The rain is happening in India and Ireland"
+   - Expected output: `["India", "Ireland"]`
+
+## Usage
+To run the script, you need Python 3 installed on your system. You can execute it using the following command:
+
+```bash
+python 0003-regex-findall.py
+```
+
+## Example Output
+```
+['India']
+['India', 'Ireland']
+```
+
+## Dependencies
+- Python 3.x
+- `re` module (comes built-in with Python)
+