#16 - python

Author: duendeintemporal

Roadmap/16 - EXPRESIONES REGULARES/python/duendeintemporal.py

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+#16 { Retos para Programadores } EXPRESIONES REGULARES
+
+# Bibliography reference
+# Professional JavaScript for web developers by Matt Frisbie [Frisbie, Matt] (z-lib.org)
+#Python Notes for Professionals. 800+ pages of professional hints and tricks (GoalKicker.com) (Z-Library)
+# Additionally, I use GPT as a reference and sometimes to correct or generate proper comments.
+
+"""
+ * EJERCICIO:
+ * Utilizando tu lenguaje, explora el concepto de expresiones regulares,
+ * creando una que sea capaz de encontrar y extraer todos los números
+ * de un texto.
+ *
+ * DIFICULTAD EXTRA (opcional):
+ * Crea 3 expresiones regulares (a tu criterio) capaces de:
+ * - Validar un email.
+ * - Validar un número de teléfono.
+ * - Validar una url.
+ 
+"""
+
+import re
+import time
+
+# Short for print()
+log = print
+
+# Simulate the loading of a web page
+log('Retosparaprogramadores #16')
+time.sleep(2)  # Simulate a delay before showing the alert
+log('Retosparaprogramadores #16. Please open the Browser Developer Tools.')
+
+# Define a pattern and flags
+pattern0 = 'abc'
+flags = re.IGNORECASE | re.MULTILINE  # Global and case-insensitive
+
+# Create a regular expression using the re.compile() function
+regex = re.compile(pattern0, flags)
+
+log(regex)  # Output the regex object
+
+text = "time: 08:07:06"
+pattern1 = r'(time(:)?)? ?([01][0-9]|2[0-3])([:/-])([0-5][0-9])\4([0-5][0-9])'
+
+# Explanation of the regular expression:
+# - (time(:)?) : Optionally matches the word "time" followed by an optional colon (:).
+# - ? : Matches an optional space.
+# - ([01][0-9]|2[0-3]) : Matches the hour, allowing values from 00 to 23.
+# - ([:/-]) : Matches one of the characters :, /, or - and captures it for later use.
+# - ([0-5][0-9]) : Matches the minutes (00 to 59).
+# - \4 : References the fourth captured group, which is the separator (it must be the same as used between the hour and the minutes).
+# - ([0-5][0-9]) : Matches the seconds (00 to 59).
+
+matches1 = re.search(pattern1, text)
+
+if matches1:
+    log(matches1.start())  # 0
+    log(matches1.string)    # time: 08:07:06
+    log(matches1.group(0))  # time: 08:07:06
+    log(matches1.group(1))  # time:
+    log(matches1.group(2))  # :
+
+pattern = r'[0-9]'
+matches = re.search(pattern, text)
+if matches:
+    log(matches.group())  # '0'
+
+matches3 = re.findall(pattern, text)
+if matches3:
+    log(matches3)  # ['0', '8', '0', '7', '0', '6']
+
+if matches3:
+    log(matches3[0])  # 0
+    log(matches3[1])  # 8
+    log(matches3[2])  # 0
+
+pattern2 = r'\d'
+matches2 = re.search(pattern2, text)
+if matches2:
+    log(matches2.group())  # '0'
+
+matches4 = re.findall(pattern2, text)
+if matches4:
+    log(matches4)  # ['0', '8', '0', '7', '0', '6']
+
+# exec: Returns the first match and can be used in a loop to find all matches.
+# findall: Returns a list with all matches in a more direct and straightforward way.
+
+# Extra Difficulty Exercise:
+
+def validate_tlf(num):
+    if not re.match(r'^\d{11}$', str(num)):
+        log("Invalid telephone number. Must be a numeric value and have 11 digits.")
+        return False
+    return True
+
+def validate_email(email):
+    email_regex = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
+    if not re.match(email_regex, email):
+        log("Invalid email address")
+        return False
+    return True
+
+def validate_url(url):
+    url_regex = r'^(https?:\/\/)?([a-zA-Z0-9.-]+)(:[0-9]{1,5})?(\/[^\s]*)?$'
+    if not re.match(url_regex, url) or (not url.startswith('http://') and not url.startswith('https://')):
+        log("Invalid URL")
+        return False
+    return True
+
+num1 = 1562737848
+num2 = 34587452387
+email1 = '[email protected]'
+email2 = '[email protected]'
+url1 = 'http://palnetaneurodiverso.org'
+url2 = 'https://moebius.org'
+url3 = 'something.com'
+url4 = 'gato'
+
+log(validate_tlf(num1))  # Invalid telephone number. Must be a numeric value and have 11 digits. False
+log(f'Is a valid tlf: {validate_tlf(num2)}')  # Is a valid tlf: True
+log(f'Is a valid email: {validate_email(email1)}')  # Is a valid email: True
+log(f'Is a valid email: {validate_email(email2)}')  # Is a valid email: True
+log(f'Is a valid URL: {validate_url(url1)}')        # Is a valid URL: True
+log(f'Is a valid URL: {validate_url(url2)}')        # Is a valid URL: True
+log(f'Is a valid URL: {validate_url(url3)}')        # Invalid URL & Is a valid URL: False
+log(f'Is a valid URL: {validate_url(url4)}')        # Invalid URL & Is a valid URL: False
+