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String matches() perform case sensitive matching. before, after, or between characters. ). for java or perl) and to immediately view the results, including the captured elements. 2. Java Regex. RegEx Testing From Dan's Tools. regular expressions testing, online check, replacement, evaluation i.e. ) for all but (\\w+) - it will make the expression bigger but it will also help the regex engine (it doesn't need to capture text) and will make your life easier as well (you're only after one group so let it be (capturing) group no. To match start and end of line, we use following anchors:. This site allows you to check the operation of the regular expression for Java. If you want case insensitive matching, there are two options. Dollar ($) matches the position right after the last character in the string. 1 instead of 6, 14 or 42 etc. Currently it implements the Java, JavaScript and most of the Perl regular expression grammar. Line Anchors. Case Insensitive Matching. 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