![]() ![]() Operations provided by String class: matches(), replaceAll(), replaceFirst() and split() supports Regex. That means next find() will start from beginning. Matcher#reset(), discards all of its explicit state information and sets its append position to zero.Matcher#replace("newString") is also useful to replace parts with the new string which is based on underlying regex pattern.Whereas, find() can match in a substring. The Difference between find() and matches() is that, matches() tries to match the expression against the entire string.Matcher#matches is equivalent to static call Pattern#matches, but works with the underlying compiled pattern.Note that Matcher class implements MatchResult interface which defines query methods to determine the results of a match against a regular expression. At that point we can use other methods like Matcher#start(), Matcher#end() and Matcher#group() to find start index, end index and the string value of the match respectively. Each time we call it and if it returns true then we found a match. ![]() This object is a stateful Object, meaning we can call it's method Matcher#find multiple times. After getting the instance of Pattern, we can call patternInstance#matcher("theInputString") which returns instance of Matcher.If a pattern is reused multiple times we should use the same compiled pattern for performance reasons. We can also compile the regex pattern using another static method Pattern#compile("theRegex"). ![]() The first argument is regex, and second is the input string. Pattern.matches("xyz", "xyz") will return true.
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