siddhantrao23 / dre

Dreadful Regex Engine

Dreadful Regex Engine

Cases Handled

• CARET symbol (^): matching beggining of string
• DOLLAR symbol ($): matching end of string
• DOT symbol (.): matching any character
• STAR symbol (*): matching the preceding character 0 or more times
• PLUS symbol (+): matching the preceding character 1 or more times
• QUESTION symbol (?): matching the preceding character 0 or 1 time
• DIGIT (\d): matching digits 0-9
• ALPHA (\w): matching alphabets a-zA-Z
• CHAR_CLASS ([...]): matching any characters in the set

Usage

The engine provides a match function used as:

void match(char *pattern, char *text);

It furthur compiles the regex pattern into a form usable in the next stages.