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Hello. In this video we are going to speak how to match an exact occurrence of a character inside a string. As an example, lets match two consecutive A characters. Have a look: in the string weve got only two occurrences of double As at the beginning and in the middle. Now, in order to match it, we can use a pattern with a lookbehind and a lookahead, like this one. Here, the negative lookbehind matches a location that is not immediately preceded with an A and negative lookahead fails the match if there is an A immediately to the right of the current location. We can control the amount of A characters we match with the limiting quantifier. In this case, it says two, but we can match three or we can match just one. Although in this case we can just remove this limiting quantifier because it is redundant. We can replace A with any other pattern that matches any single character. For example, lets match chunks of two digits, not three, not four, not one, two digits. We need
