This method attempts to match the entire input by default to find the next If the pattern specifies no groups, then the result will be an empty list Groups (or a null element if a group did not match any input). If the match succeeds, the result is a list of the matching
Val repl = varPattern replaceSomeIn (text, mapper) Val mapper = (m: Match) => vars get (m group 1) map (quoteReplacement(_)) Val text = "A text with variables %x, %y and %z." Information can be obtained from the match. The replacer function takes a .Match so that extra Replaces some of the matches using a replacer function that returns an scala.Option. def replaceAllIn ( target: CharSequence, replacement: String) : String.The function which maps a match to another string.
Use Regex.quoteReplacement to escape these characters. Will be interpreted as an escape character and can be used to escape theĭollar sign. Interpreted as a reference to a group in the matched pattern, with numbersġ through 9 corresponding to the first nine groups, and 0 standing for the In the replacement String, a dollar sign ( $) followed by a number will be Implicitly for strings: val date = raw "(\d") The canonical way to create a Regex is by using the method r, provided Once, outside of loops and perhaps in a companion object. Since compilation is expensive, frequently used Regexes should be constructed The regular expression syntax for pattern strings.Īn instance of Regex represents a compiled regular expression pattern. See the documentation for for details about This class delegates to the package of the Java Platform. Definition Classes rootĪ regular expression is used to determine whether a string matches a patternĪnd, if it does, to extract or transform the parts that match. For example, on the JVM, String is an alias for. Other aliases refer to classes provided by the underlying platform. Some of these identifiers are type aliases provided as shortcuts to commonly used classes. Identifiers in the scala package and the scala.Predef object are always in scope by default.
Or Option which are accessible in all Scala compilation units without explicit qualification or The scala package contains core types like Int, Float, Array It's not free, but it's the best regex tool out there by far- and it keeps getting better with every incremental release.This is the documentation for the Scala standard library. Unfortunately, JavaScript doesn't support negative lookbehind, so if you want to test that one, I recommend RegexBuddy. You can test this regex in the cool online JavaScript Regex evaluator. To avoid incompatibility, we can restate our solution using negative lookahead: And those that do typically have severe restrictions on the lookbehind, eg, it must be a simple fixed-length expression. One easy way to exclude text from a match is negative lookbehind:īut not all regex flavors support negative lookbehind. Stating a regex in terms of what you don't want to match is a bit harder. It's easy to formulate a regex using what you want to match. Regular expressions are great at matching. The quick brown jumped over the lazy dog. and I used a regular expression of (which I know is incorrect) (why this doesn't work I don't understand it would make life SO much easier), then the returned search results would be: The quick brown fox jumped over the lazy dog. The regular expression should find and return everything EXCEPT the text string in the search expression.įor example, if the word fox was what I wanted to exclude, and the searched text was: I am trying to find a way to exclude an entire word from a regular expression search. I seem to have stumbled upon a puzzle that evidently is not new, but for which no (simple) solution has yet been found.
Excluding Matches With Regular Expressions