capturing-group

I'm new to regular expressions in Java (or any language, for that matter) and I'm wanting to do a find using them. The tricky part that I don't understand how to do is replace something inside the string that matches. For example, if the line I'm looking for is Person item6 [can {item thing [wrap]}] I'm able to write a regex that finds that line, but finding what the word "thing" is (as it may differ among different lines) is my problem. I may want to either replace that word with something else or save it in a variable for later. Is there any easy way to do this using Java's regex engine? Yes

I'm attempting to extract the URL parameters via regex and am sooo close to getting it to work. I even know what the problem is: my regex is stumbling on repeated capture groups. But I simply cannot figure out how to fix it. Language is PHP. My URL looks something like the one below. It can have no parameters, just one or multiple: member.php?action=bla&arg=2&test=15&schedule=16 My regex looks like this: member\.php((?:[\?|&](\w*)=(\w*))*) And my capture groups end up being: 1. action=bla&arg=2&test=15&schedule=16 2. schedule 3. 16 I cannot figure out how to capture all the parameters

As the title suggests, I'm trying to retrieve the domain from a string using javascript regular expression. Take the following strings: String ==> Return "google" ==> null "google.com" ==> "google.com" "www.google.com" ==> "www.google.com" "ftp://ftp.google.com" ==> "ftp.google.com" "http://www.google.com" ==> "www.google.com" "http://www.google.com/" ==> "www.google.com" "https://www.google.com/" ==> "www.google.com" "https://www.google.com.sg/" ==> "www.google.com.sg" "https://www.google.com.sg/search/" ==> "www.google.com.sg" "*://www.google.com.sg/search/" ==> "www.google.com.sg" I've

Let's say I have this code: val string = "one493two483three" val pattern = """two(\d+)three""".r pattern.findAllIn(string).foreach(println) I expected findAllIn to only return 483 , but instead, it returned two483three . I know I could use unapply to extract only that part, but I'd have to have a pattern for the entire string, something like: val pattern = """one.*two(\d+)three""".r val pattern(aMatch) = string println(aMatch) // prints 483 Is there another way of achieving this, without using the classes from java.util directly, and without using unapply? Here's an example of how you can

Can't get why this regex ( regex101 ) /[\|]?([a-z0-9A-Z]+)(?:[\(]?[,][\)]?)?[\|]?/g captures all the input, while this ( regex101 ) /[\|]+([a-z0-9A-Z]+)(?:[\(]?[,][\)]?)?[\|]?/g captures only |Func Input string is |Func(param1, param2, param32, param54, param293, par13am, param)| Also how can i match repeated capturing group in normal way? E.g. i have regex /\(\(\s*([a-z\_]+){1}(?:\s+\,\s+(\d+)*)*\s*\)\)/gui And input string is (( string , 1 , 2 )) . Regex101 says "a repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all

In scala.util.matching.Regex trait MatchData I see that there support for groupnames , I thought that this was related to ( Regex Named Capturing Groups ) But since Java does not support groupnames until version 7 as I understand it ( ref ), Scala version 2.8.0 (Java HotSpot(TM) 64-Bit Server VM, Java 1.6. gives me this exception: scala> val pattern = """(?<login>\w+) (?<id>\d+)""".r java.util.regex.PatternSyntaxException: Look-behind group does not have an obvio us maximum length near index 11 (?<login>\w+) (?<id>\d+) ^ at java.util.regex.Pattern.error(Pattern.java:1713) at java.util.regex

((\d{1,2})/(\d{1,2})/(\d{2,4})) Is there a way to retrieve a list of all the capture groups with the Pattern object. I debugged the object and all it says is how many groups there are (5). I need to retrieve a list of the following capture groups. Example of output: 0 ((\d{1,2})/(\d{1,2})/(\d{2,4})) 1 (\d{2})/(\d{2})/(\d{4}) 2 \d{2} 3 \d{2} 4 \d{4} Update: I am not necessarily asking if a regular expression exists, but that would be most favorable. So far I have created a rudimentary parser (I do not check for most out-of-bounds conditions) that only matches inner-most groups. I would like to