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Hello. In this video we are going to speak about how to fix some specific case of catastrophic backtracking. One of the features that makes regular expressions that powerful is their ability to backtrack. Backtracking means accommodating all the subsequent patterns to provide a valid match. Sometimes backtracking takes so much time that the regex engine cannot compute all possible ways to match a string in a reasonable period of time. In that case, we call that backtracking catastrophic. Catastrophic backtracking happens in most cases when we have some optional pattern in between some obligatory patterns. Letamp;#39;s have a look at this regular expression. This regular expression contains several groups that are quantified with asterisk. It means that these sequences inside the group can repeat zero or more times. However, you can see that the first atom here that matches a dot or a hyphen actually is optional. It matches one or zero occurrences of a hyphen or dot. It means that in f
