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Topics: PCRE

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• How to remove duplicate lines with regular expressions

  

  By StevenLevithan : 30 October 2009 - 08:35 AM

  There is a variety of software (including the Unix command-line utility uniq and Windows PowerShell cmdlet Get-Unique) that can help you remove duplicate lines in a file or ...

  Tags:

  • duplicates
  • regex
  • regular expression
  • .NET
  • java
  • javascript
  • PCRE
  • perl
  • python
  • ruby
  • php

  1Vote

  0Comments

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• How to validate traditional date formats with regular expressions

  

  By Jan Goyvaerts : 18 September 2009 - 12:45 PM

  If you want to validate dates in the traditional formats mm/dd/yy, mm/dd/yyyy, dd/mm/yy, and dd/mm/yyyy, using a simple regex that simply checks whether the input looks ...

  Tags:

  • ruby
  • python
  • perl
  • PCRE
  • javascript
  • java
  • .Net
  • dates
  • regex

  1Vote

  0Comments

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• How to match whole words with a regular expression

  

  By Jan Goyvaerts : 16 September 2009 - 03:20 PM

  Create a regex that matches cat in My cat is brown, but not in category or bobcat. Create another regex that matches cat in staccato, but not in any of the three previous subject str...

  Tags:

  • regex
  • .Net
  • java
  • javascript
  • PCRE
  • perl
  • python
  • ruby

  2Votes

  0Comments

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• How to match something at the Start and/or End of a line with a regular expression

  

  By Jan Goyvaerts : 16 September 2009 - 02:18 PM

  Create four regular expressions. Match the word alpha, but only if it occurs at the very beginning of the subject text. Match the word omega, but only if it occurs at the very e...

  Tags:

  • python
  • perl
  • PCRE
  • javascript
  • java
  • .Net
  • regex
  • ruby

  0Votes

  0Comments

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• How to use Unicode code points, properties, blocks, and scripts in regular expressions

  

  By Jan Goyvaerts : 16 September 2009 - 01:05 PM

  The following are common uses for Unicode code points, properties, blocks and scripts: Use a regular exp​ression to find the trademark sign (™) by specifying its Unicode code point ...

  Tags:

  • perl
  • unicode
  • regex
  • code points
  • .Net
  • PCRE
  • javascript
  • java
  • python
  • ruby

  0Votes

  0Comments

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• How to match nonprintable characters with a regular expression

  

  By Jan Goyvaerts : 16 September 2009 - 11:57 AM

  Let's match a string of the ASCII control characters: bell, escape, form feed, line feed, carriage return, horizontal tab, vertical tab. These characters have the hexadecimal A...

  Tags:

  • regex
  • ASCII
  • java
  • nonprintable
  • PCRE
  • javascript
  • .Net
  • python
  • ruby

  1Vote

  0Comments

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