The Search function also provides some advanced matching combinations. We will now introduce the most famous one and later practice them in the exercise:

• \A - Matches if the specified characters are at the start of a string;
• \b - Matches if the specified characters are at the beginning or end of a word;
• \D - Matches any non-decimal digit. Equivalent to [^0-9];
• \d - Matches any decimal digit. Equivalent to [0-9];
• \B - Opposite of \b. Matches if the specified characters are not at the beginning or end of a word;
• . - period matches any single character.