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• Scala regex Named Capturing Groups

  - by Brent

  In scala.util.matching.Regex trait MatchData I see that there support for groupnames (Named Capturing Groups) But since Java does not support groupnames until version 7 as I understand it, Scala version 2.8.0.RC4 (Java HotSpot(TM) 64-Bit Server VM, Java 1.6. gives me this exception: scala> val pattern = """(?<login>\w+)…

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• Is regex too slow? Real life examples where simple non-regex alternative is better

  - by polygenelubricants

  I've seen people here made comments like "regex is too slow!", or "why would you do something so simple using regex!" (and then present a 10+ lines alternative instead), etc. I haven't really used regex in industrial setting, so I'm curious if there are applications where regex is demonstratably just too slow, AND where a simple…

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• Can the csv format be defined by a regex?

  - by Spencer Rathbun

  A colleague and I have recently argued over whether a pure regex is capable of fully encapsulating the csv format, such that it is capable of parsing all files with any given escape char, quote char, and separator char. The regex need not be capable of changing these chars after creation, but it must not fail on any other edge…

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• Java regex patterns - compile time constants or instance members?

  - by KepaniHaole

  Currently, I have a couple of singleton objects where I'm doing matching on regular expressions, and my Patterns are defined like so: class Foobar { private final Pattern firstPattern = Pattern.compile("some regex"); private final Pattern secondPattern = Pattern.compile("some other regex"); // more Patterns, etc. …

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• .NET RegEx "Memory Leak" investigation

  - by Kevin Pullin

  I recently looked into some .NET "memory leaks" (i.e. unexpected, lingering GC rooted objects) in a WinForms app. After loading and then closing a huge report, the memory usage did not drop as expected even after a couple of gen2 collections. Assuming that the reporting control was being kept alive by a stray event handler I…

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• Regex one-to-one mapping pattern replace

  - by polygenelubricants

  How would you use regex to write a function that replaces all lowercase letters with uppercase and vice versa? Note: this is NOT a homework question. See also my previous explorations of regex: Regex split into overlapping strings (Alan Moore's answer is especially instructive) Can you use zero-width matching regex in…

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• Does REGEX differ from PHP to Python

  - by daemonfire300

  hi there, I found this post: http://stackoverflow.com/questions/118143/python-regex-vs-php-regex but I actually did not get if Python's REGEX syntax matches PHP's REGEX syntax. I started to convert some of my old PHP code to python (due to g's appengine etc.), and now I would like to know whether the regex is 100%…

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• Python regex compile (with re.VERBOSE) not working

  - by bfloriang

  I'm trying to put comments in when compiling a regex but when using the re.VERBOSE flag I get no matchresult anymore. (using Python 3.3.0) Before: regex = re.compile(r"Duke wann", re.IGNORECASE) print(regex.search("He is called: Duke WAnn.").group()) Output: Duke WAnn After: regex = re.compile(r''' Duke #…

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• Regex: How do I match some regex logic 1 or more times?

  - by tom

  I already have some regex logic which says to look for a div tag with class=something. However, this might occur more than once (one after another). You can't simply add square brackets around that complex regex logic already (e.g. [:some complicated regex logic already existing:]* -- so how do you do it in…

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• Reguläre Ausdrücke Kochbuch

  - by Jan Goyvaerts

  Regular Expressions Cookbook was translated into German

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• How do you capture a group with regex?

  - by Sylvain

  Hi, I'm trying to extract a string from another using regex. I'm using the POSIX regex functions (regcomp, regexec ...), and I fail at capturing a group ... For instance, let the pattern be something as simple as "MAIL FROM:<(.*)>" (with REG_EXTENDED cflags) I want to capture everything between…

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• ASP.NET MVC Cookbook &ndash; public review

  I have recently started writing another book. The topic of this book is ASP.NET MVC. This book differs from my previous book in that rather than working towards building one project from end to end this book will demonstrate specific topics from end to end. It is a recipe book (hence the cookbook name)…

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• SOA Suite 11g Developers Cookbook Published

  - by Antony Reynolds

  SOA Suite 11g Developers Cookbook Available Just realized that I failed to mention that Matt & mine’s most recent book, the SOA Suite 11g Developers Cookbook was published over Christmas last year! In some ways this was an easier book to write than the Developers Guide, the hard bit was deciding…

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• libstdc++ - compiling failing because of tr1/regex

  - by Radek Šimko

  I have these packages installed on my OpenSUSE 11.3: i | libstdc++45 | Standard shared library for C++ | package i | libstdc++45-devel | Contains files and libraries for development | package But when i'm trying to compile this C++ code: #include <stdio.h> #include…

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• How does the ? make a quantifier lazy in regex

  - by Uriel Katz

  I've been looking into regex lately and figured that the ? operator makes the *,+, or ? lazy. My question is how does it do that? Is it that *? for example is a special operator, or does the ? have an effect on the *? In other words, does regex recognize *? as one operator in itself, or does regex…

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• Regex: how to get contents from tag inner (use javascript)?

  - by lazyanno

  page contents: aa<b>1;2'3</b>hh<b>aaa</b>.. .<b>bbb</b> blabla.. i want to get result: 1;2'3aaabbb match tag is <b> and </b> how to write this regex using javascript? thanks!

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• codingbat wordEnds using regex

  - by polygenelubricants

  I'm trying to solve wordEnds from codingbat.com using regex. This is the simplest as I can make it with my current knowledge of regex: public String wordEnds(String str, String word) { return str.replaceAll( String.format( ".*?(?=%s)(?<=(.|^))%1$s(?=(.|$))|.+", …

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• Regex pattern failing

  - by Scott Chamberlain

  I am trying a substring to find from the beginning of the string to the point that has the escape sequence "\r\n\r\n" my regex is Regex completeCall = new Regex(@"^.+?\r\n\r\n", RegexOptions.Compiled); it works great as long as you only have strings like 123\r\n\r\n however once you…

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• Nested Groups in Regex

  - by cryptic-star

  I'm constructing a regex that is looking for dates. I would like to return the date found and the sentence it was found in. In the code below, the strings on either side of date_string should check for the conditions of a sentence. For your sake, I've omitted the regex for…

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• Regex | validation error

  - by MMRUser

  I'm trying to validate a USA mobile number, since I'm using pre-built javascript validation library I just replaced this regex validation with the previous one which comes with the validation library. previous validation regex: "telephone":{ "regex":"/^[0-9\-\(\)\…

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• How does the following regex pattern work?

  - by zSysop

  Hi all, I'm horrible with regex but i'm trying to figure out how an import function works and i came across this regex pattern. Maybe one of you can help me understand how it works. string pattern =…

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• regex to check string is certain length

  - by Aly

  Hi, I am trying to write a regex to match pairs of cards (AA, KK, QQ ... 22) and I have the regex ([AKQJT2-9])\1. The problem I have is that this regex will match AA as well as AAbc etc. Is there a…

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• Regex pattern help for phrase OR a character set

  - by andybaird

  I have a PHP regex that I want to fail if the matched word after /blog is just "feed". This MUST be done within the regex itself, not using any other PHP syntax. The regex currently looks like…

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• .NET RegEx for letters and spaces

  - by user70192

  I am trying to create a regular expression in C# that allows only alphanumeric characters and spaces. Currently, I am trying the following: string pattern = @"^\w+$"; Regex regex = new…

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• vbscript multiple replace regex

  - by George

  How do you match more than one pattern in vbscript? Set regEx = New RegExp regEx.Pattern = "[?&]cat=[\w-]+" & "[?&]subcat=[\w-]+" // tried this regEx.Pattern =…

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