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Regex: This or that or none


Regex: This or that or none

By : user2950108
Date : November 17 2020, 11:52 AM
help you fix your problem How would I write a regex to say, "this or that or none of the above?" , You've almost got it.
code :
^myapplication(\.exe|\.app)?$


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XSL write second regex using output of first regex and overwrite substring with ancestor of second regex's hit

XSL write second regex using output of first regex and overwrite substring with ancestor of second regex's hit


By : Linzmeister
Date : March 29 2020, 07:55 AM
will be helpful for those in need You haven't said which version of XSLT and which XSLT processor you want to use but assuming you can use Saxon 9.6 HE at least you can make use of the XPath 3.0 parse-xml-fragment function to parse that encoded markup into nodes and then process them further on, only needing regular expressions to find and extract the onclick attribute.
So based on that I created a sample input
code :
<root>
  <references>
    <c hw="A">
      <e hw="aardvark">
        <d t="see &lt;a onclick=&quot;goToEntryWithId('2319')&quot;&gt;mammals&lt;/a&gt; for more details."/>
      </e>
    </c>
  </references>
  <content>
    <c hw="M">
      <e hw="mammals" i="2319">
        <d t="Here's useful info about mammals."/>
      </e>
    </c>
  </content>
</root>
<xsl:stylesheet
  version="3.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  exclude-result-prefixes="xs">

<xsl:param name="pattern" as="xs:string">^goToEntryWithId\('[0-9]+'\)$</xsl:param>

<xsl:output method="html" indent="yes"/>

<xsl:key name="id" match="content/c/e" use="@i"/>

<xsl:variable name="main-doc" select="/"/>

<xsl:template match="/">
  <html>
    <body>
      <xsl:apply-templates select="root/references//@t"/>
    </body>
  </html>
</xsl:template>

<xsl:template match="references/c/e/d/@t">
  <p>
    <xsl:apply-templates select="parse-xml-fragment(.)/node()"/>
  </p>
</xsl:template>

<xsl:template match="a[@onclick[matches(., $pattern)]]">
  <xsl:variable name="id" select="replace(@onclick, '[^0-9]+', '')"/>
  <xsl:variable name="referenced-c" select="key('id', $id, $main-doc)/ancestor::c[@hw]"/>
  <a href="{$referenced-c/@hw}.html#{$id}">
    <xsl:apply-templates/>
  </a>
</xsl:template>

</xsl:stylesheet>
<html>
   <body>
      <p>see <a href="M.html#2319">mammals</a> for more details.
      </p>
   </body>
</html>
Regex - Invalid target for quantifier which converting C# Regex to JavaScript Regex

Regex - Invalid target for quantifier which converting C# Regex to JavaScript Regex


By : nalkiste
Date : March 29 2020, 07:55 AM
it should still fix some issue In .NET, this regex must have been used with IgnorePatternWhitespace and IgnoreCase flags since there is a space that prevents matching. Here is a demo.
The problems you encounter when porting the regex to JS are caused by the fact that JS regex does not support lookbehinds and conditionals.
code :
/^(?:(?=")("[^"\\]*(?:\\.[^"\\]*)*"@)|(?!")(([0-9a-z]((\.(?!\.))|[-!#$%&'*+\/=?^`{}|~\w])*)?[a-z0-9]@))(?:(?=\[)(\[(\d{1,3}\.){3}\d{1,3}\])|(?!\[)(([0-9a-z][-\w]*[0-9a-z]*\.)+[a-z0-9][-a-z0-9]{0,22}[a-z0-9]))$/i
perl6 Regex subrules and named regex MUCH MUCH slower than explicit regex; how to make them equally fast?

perl6 Regex subrules and named regex MUCH MUCH slower than explicit regex; how to make them equally fast?


By : Alex B
Date : March 29 2020, 07:55 AM
will be helpful for those in need The problem isn't use of subrules / naming regexes. It's what's inside the regex. It's:
code :
[ <{<iron copper carbon>.join("||")}> ]
[ iron || copper || carbon ]
my regex a { || < iron copper carbon > }
my @matchers = < iron copper carbon >;
my regex a { || @matchers }
my @matchers = / i..n /, / cop+er /, / carbon /;
my regex a { || @matchers }
my $a=rx/ [ <{ < iron copper carbon > .join("||") }> ] /
<{ ...  }>
Does C# regex support embedding regex options directly inside the regex itself?

Does C# regex support embedding regex options directly inside the regex itself?


By : user2939260
Date : March 29 2020, 07:55 AM
seems to work fine Some regular expression engines support embedding regex options directly inside the regex itself. Like (?i)is, which matches the string is ignoring cases. Does C# support this feature? I skimmed over the documentation at this page, but didn't find anything.
code :
using System;
using System.Text.RegularExpressions;

class MainClass {
  public static void Main (string[] args) {
    string text = "is, IS";
    string regex = "(?i)is";
    MatchCollection matches = Regex.Matches(text, regex);
    Console.WriteLine("{0} matches found in:\n   {1}", matches.Count, text);
  }
}
2 matches found in:
   is, IS
Why Regex CompileToAssembly giving slower performance than compiled regex and Interpreted Regex?

Why Regex CompileToAssembly giving slower performance than compiled regex and Interpreted Regex?


By : Lucas Faria
Date : March 29 2020, 07:55 AM
should help you out Your code has a problem: static field initializers will run before static methods run. That means that level4 has already been assigned before Main() runs. This means that the object referred to by level4 is not an instance of the class created in CompileToAssembly().
Note that the example code for Regex.CompileToAssembly shows the compilation of the regex and its consumption in two different programs. The actual regex you're timing as "CompiledToAssembly" could therefore be a different regex that you compiled in an earlier test.
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