The file type configuration sets the default. The Options menu only affects a single file.
Many of these options can be changed for individual files via the Options menu. On the Editor tab in the file type configuration, you indicate the default editor options for each file type. Buy Java Regular Expressions from Amazon.File Type Editor Options File Type Editor Options.My review of the book Java Regular Expressions Groovy only ads some syntactic shortcuts, which are all explained on this web page. Though this book doesn’t mention Groovy at all, it is the most detailed guide to the package, which is what you’re using with Groovy. If you’d like a more detailed overview of all the functionality offered by the package, you may want to get yourself a copy of “Java Regular Expressions” written by Mehran Habibi and published by Apress. To find partial matches, you need to use the Matcher. myString =~ /regex/ is equivalent to myString.matches(/regex/). This short for: Matcher myMatcher = pile(/regex/).matcher("subject")įinally, the =~ operator is a quick way to test whether a regex can match a string entirely. In Groovy, you can create this instance directly from the literal string with your regular expression using the =~ operator. To find regex matches or to search-and-replace with a regular expression, you need a Matcher instance that binds the pattern to a string. The only time you need the Pattern instance is to split a string, which requires you to call Pattern.split(). You won’t actually instantiate patterns this way very often. When assigning this pattern to a variable, make sure to leave a space between the assignment operator and the tilde. The string can use any of Groovy’s five string styles. To create a Pattern instance, simply place a tilde before the string with your regular expression. But Groovy does provide some special syntax that allows you to create those instances with much less typing. You use these classes in Groovy just like you do in Java. To actually use that pattern on a string, you need to instantiate the class. To actually use a string as a regular expression, you need to instantiate the class. Unfortunately, strings delimited with forward slashes cannot span across lines, so you can’t use them for free-spacing regular expressions. Both /hello/ and "hello" are literal instances of. The string is placed between forward slashes, and only forward slashes (not backslashes) in the string need to be escaped. The fifth string style is provided specifically for regular expressions. Unfortunately, all four of these string styles require backslashes to be escaped.
Using triple single or double quotes allows the string to span multiple lines, which is handy for free-spacing regular expressions. Strings can be placed between single quotes, double quotes, triple single quotes, and triple double quotes. That yields a forest of backslashes in literal regular expressions. Double quotes and backslashes in strings must be escaped with backslashes. Strings are placed between double quotes. It’s all based in the package, which you’ll need to import regardless. You can mix the Groovy-specific syntax with regular Java code.
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Groovy has a bunch of language features that make code using regular expressions a lot more concise. Using verbose Java code to work with regular expressions in Groovy wouldn’t be very groovy. Any Java code using regular expressions will then automatically work in your Groovy code too. Simply put import .* at the top of your Groovy source code. Because Groovy is based on Java, you can use Java’s regular expression package with Groovy.