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class MyRegex{
String pat = "([01]?[0-9]?[0-9]?|2[0-4]?[0-9]|2[0-5]?[0-5?])";
String pattern = "^" + pat + "\." + pat + "\." + pat + "\." + pat ;
}
Here pat accepts number string only ranges between 0 to 255.
Pattern make sures that IP addr should start with number 0 to 255 and "\." add point between numbers.
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Java Regex
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class MyRegex{ String pat = "([01]?[0-9]?[0-9]?|2[0-4]?[0-9]|2[0-5]?[0-5?])"; String pattern = "^" + pat + "\." + pat + "\." + pat + "\." + pat ; }
Here pat accepts number string only ranges between 0 to 255. Pattern make sures that IP addr should start with number 0 to 255 and "\." add point between numbers.