String - Regex & Cleaning

Advanced string manipulation using built-in regular expressions for extracting digits, filtering words, removing whitespace, and checking content types.

1. 🗑️ Removal & Extraction

   extractDigits() · String

   Extracts all numerical digits from the string and returns them as a new string. All non-digit characters are removed.

   final messy = 'Price: $12.99 USD';
   print(messy.extractDigits()); // "1299"
   

   removeAllDigits() · String

   Removes all numerical digits (0-9) from the string.

   final mixed = 'Address line 123 Street 4';
   print(mixed.removeAllDigits()); // "Address line  Street "
   

   removeAllWhiteSpaces() · String

   Removes all whitespace characters (spaces, tabs, newlines) from the string.

   final long = 'one two\nthree';
   print(long.removeAllWhiteSpaces()); // "onetwothree"
   

   removeAllWordsStartingWithNumber() · String

   Removes words that begin with a number (e.g., ‘3rd’, ‘10users’) and cleans up extra spaces.

   final input = '10users 3rd place is here 54.';
   print(input.removeAllWordsStartingWithNumber()); // "place is here 54."
   

   getWords() · String

   Extracts all individual words from the string based on word boundaries. Useful for keyword extraction.

   final sentence = 'The Flutter app is amazing!';
   print(sentence.getWords()); // ["The", "Flutter", "app", "is", "amazing"]
   
2. 🛡️ Validation

   isDigitsOnly() · bool

   Checks if the entire string consists only of numerical digits (0-9).

   print('12345'.isDigitsOnly());   // true
   print('123 a'.isDigitsOnly());   // false
   

   isTextOnly() · bool

   Checks if the entire string consists only of alphabet letters (a-z, A-Z).

   print('Flutter'.isTextOnly());    // true
   print('Flutter Dev'.isTextOnly()); // false (contains space)
   
3. ✂️ Splitting

   splitByUpperCase() · List<String>

   Splits a string into a list of substrings whenever an uppercase letter is encountered. Ideal for converting PascalCase to readable words.

   final camel = 'UserProfileData';
   print(camel.splitByUpperCase()); // ["User", "Profile", "Data"]
   

🗑️ Removal & Extraction

🛡️ Validation

✂️ Splitting