For the above specified passage, which of the following represents the regular expression?

The correct answer is (a + b)* abb(a + b)*.

Key Points

• The given regular expression (a + b)* abb(a + b)* matches any string that has "abb" in between any combination of 'a' and 'b' characters.
  • The part (a + b)* indicates any combination (including none) of 'a' and 'b' characters before "abb".
  • The part abb is the fixed substring that must appear in the string.
  • The part (a + b)* after "abb" indicates any combination (including none) of 'a' and 'b' characters after "abb".
• This regular expression ensures that "abb" is always present in the string, surrounded by any number of 'a' and 'b' characters.

Additional Information

• Regular expressions are powerful tools used for pattern matching and string manipulation.
• They are widely used in various programming languages and tools for searching, replacing, and validating text.
• Understanding the components and structure of regular expressions is essential for effectively utilizing them in different applications.
• Common operations using regular expressions include searching for specific patterns, validating input data, and parsing text.