add regex hw

homework/week5/regex/regex.py

@@ -0,0 +1,46 @@
+import re
+
+# Function to match a regular expression pattern in a string
+def match_pattern(pattern, text):
+    """
+    Match a regular expression pattern in a given text and return the result.
+    """
+    matches = re.findall(pattern, text)
+    return matches
+
+# Function to find and replace using regular expressions
+def find_and_replace(pattern, replacement, text):
+    """
+    Find and replace all occurrences of a regular expression pattern in a given text with a replacement string.
+    """
+    replaced_text = re.sub(pattern, replacement, text)
+    return replaced_text
+
+# Function to split a string using a regular expression
+def split_text(pattern, text):
+    """
+    Split a text into a list of substrings using a regular expression pattern as the delimiter.
+    """
+    substrings = re.split(pattern, text)
+    return substrings
+
+# Example usage
+if __name__ == "__main__":
+    # Example text
+    sample_text = "Hello, my email is [email protected] and my phone number is 123-456-7890."
+
+    # 1. Matching a pattern
+    email_pattern = r'WRITE_HERE'
+    email_matches = match_pattern(email_pattern, sample_text)
+    print("Email matches:", email_matches)
+
+    # 2. Finding and replacing
+    phone_pattern = r'WRITE_HERE'
+    replaced_text = find_and_replace(phone_pattern, "XXX-XXX-XXXX", sample_text)
+    print("Text after phone number replacement:")
+    print(replaced_text)
+
+    # 3. Splitting text
+    words_pattern = r'WRITE_HERE'
+    word_list = split_text(words_pattern, sample_text)
+    print("Words in the text:", word_list)