Day 19

Author: thedarkking01

Diff for: Day 19 regular exp.js

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+// Activity 1: Basic Regular Expressions
+//Task 1: Write a regular expression to match a simple pattern (e.g., match all occurrences of the word "JavaScript" in a string). Log the matches.
+
+const text1 = "JavaScript is a versatile language. JavaScript can be used for both front-end and back-end development.";
+const pattern1 = /JavaScript/g;
+
+const matches1 = text1.match(pattern1);
+console.log("Matches for Task 1:", matches1);
+
+
+//Task 2: Write a regular expression to match all digits in a string. Log the matches
+
+const text2 = "The year 2024 marks a new era. My phone number is 123-456-7890.";
+const pattern2 = /\d+/g;
+
+const matches2 = text2.match(pattern2);
+console.log("Matches for Task 2:", matches2);
+
+
+// Activity 2: Character Classes and Quantifiers
+//Task 3: Write a regular expression to match all words in a string that start with a capital letter. Log the matches.
+
+const text3 = "JavaScript is a versatile language. The Year 2024 marks a New Era.";
+const pattern3 = /\b[A-Z][a-z]*\b/g;
+
+const matches3 = text3.match(pattern3);
+console.log("Matches for Task 3:", matches3);
+
+
+//Task 4: Write a regular expression to match all sequences of one or more digits in a string. Log the matches.
+const text4 = "There are 365 days in a year. My phone number is 123-456-7890.";
+const pattern4 = /\d+/g;
+
+const matches4 = text4.match(pattern4);
+console.log("Matches for Task 4:", matches4);
+
+// Activity 3: Grouping and Capturing
+//Task 5: Write a regular expression to capture the area code, central office code, and line number from a US phone number format (e.g., (123) 456-7890). Log the captures.
+
+const text5 = "My phone number is (123) 456-7890.";
+const pattern5 = /\((\d{3})\)\s(\d{3})-(\d{4})/;
+
+const matches5 = text5.match(pattern5);
+console.log("Matches for Task 5:", matches5);
+
+
+//Task 6: Write a regular expression to capture the username and domain from an email address. Log the captures.
+
+const text6 = "Contact me at [email protected].";
+const pattern6 = /(\w+)@(\w+\.\w+)/;
+
+const matches6 = text6.match(pattern6);
+console.log("Matches for Task 6:", matches6);
+
+
+// Activity 4: Assertions and Boundaries
+//Task 7: Write a regular expression to match a word only if it is at the beginning of a string. Log the matches.
+const text7 = "JavaScript is a versatile language.";
+const pattern7 = /^\w+/;
+
+const matches7 = text7.match(pattern7);
+console.log("Matches for Task 7:", matches7);
+
+
+//Task 8: Write a regular expression to match a word only if it is at the end of a string. Log the matches.
+
+const text8 = "JavaScript is a versatile language";
+const pattern8 = /\w+$/;
+
+const matches8 = text8.match(pattern8);
+console.log("Matches for Task 8:", matches8);
+
+
+// Activity 5: Practical Applications
+//Task 9: Write a regular expression to validate a simple password (must include at least one uppercase letter, one lowercase letter, one digit, and one special character). Log whether the password is valid.
+const password = "P@ssw0rd";
+const pattern9 = /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$/;
+
+const isValidPassword = pattern9.test(password);
+console.log("Is the password valid?", isValidPassword);
+
+//Task 10: Write a regular expression to validate a URL. Log whether the URL is valid.
+
+const url = "https://www.example.com";
+const pattern10 = /^(https?:\/\/)?(www\.)?([a-zA-Z0-9]+)(\.[a-zA-Z]{2,})(\/\w*)*\/?$/;
+
+const isValidURL = pattern10.test(url);
+console.log("Is the URL valid?", isValidURL);