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That is, it must be 4 groups of 3 "anycharacters" delimited by periods. We use . to match "anycharacter" in regex. It matches everything but things like line breaks. And \. matches actual periods in the string. We have to escape the . because it is a metacharacter. So, in the solution, we're saying that between the beginning of the string ^ and the end of the string $ there will be exactly 4 groups of 3 "anycharacters" delimited by periods.
Matching Anything But a Newline
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The solution explained, piece by piece.
The solution:
^...\....\....\....$This pattern expects strings like:
111.222.333.444111.111.111.111aaa.aaa.aaa.aaaAAA.AAA.BBB.BBBabd.ghj.999.1n4That is, it must be 4 groups of 3 "anycharacters" delimited by periods. We use
.to match "anycharacter" in regex. It matches everything but things like line breaks. And\.matches actual periods in the string. We have to escape the.because it is a metacharacter. So, in the solution, we're saying that between the beginning of the string^and the end of the string$there will be exactly 4 groups of 3 "anycharacters" delimited by periods.