Regular Expression

In theoretical computer science and formal language theory, a regular expression (abbreviated regex or regexp) is a sequence of characters that forms a search pattern, mainly for use in pattern matching with strings, or string matching, i.e. "find and replace"-like operations. The concept arose in the 1950s, when the American mathematician Stephen Kleene formalized the description of a regular language, and came into common use with the Unix text processing utilities ed, an editor, and grep (global regular expression print), a filter.Each character in a regular expression is either understood to be a metacharacter with its special meaning, or a regular character with its literal meaning.
Posts about Regular Expression
  • Filtering Out Google Analytics Junk to Read Your Numbers Better

    … Organization.” Then enter the service provider of the bot using a regular expression. Keep an eye on your analytics, and be sure to create manual filters for additional bots that attempt to sneak past you. This can prevent bothersome bots and spiders from skewing your website’s data. Enforcing Lowercase If visitors enter an URL into their browser…

    @ProBloggerin Google- 11 readers -
  • How to Be Awesome At AdWords Scripting

    … problems; Russell later modified his own script on the same site to scan for text strings in the page (eg. ‘sorry’, ‘out of stock’, etc). A further extension to that – extremely simple but powerful – would be to replace the static text string that you’re looking for with a regular expression, which can be used with wildcards to match any…

    Ian Harris/ Search Engine Journalin Paid Search How To's- 8 readers -
  • 8 Tools I Discovered At #Pubcon 2014

    … or Bing. Cost: Free API: None Website: Keywordtool.io Grepwords.com Grepwords is the only keyword tool that allows for regular expression look-ups and comes with an API. It boasts 180,000,000 keywords from over 30 countries. This tool was first mentioned during the Penalty-Free Link Building session. Because Grepwords allows for regular…

    Search Engine Journalin Social SEO Google Facebook Twitter YouTube- 3 readers -
  • How to Harness the Awesomeness of Google Tag Manager

    …. For the sake of this example, let’s go with Link Click Listener. Add a rule to govern this tag. In my example, I went with All Pages, but if this activity only happens on a subset of pages on your site, write a regular expression to account for those pages. Then hit save. Important point to remember for later: when this listener is triggered, GTM…

    Leslie To/ 3Q Digitalin Google How To's- 9 readers -
  • How Regular Expression Affects SEO

    … or logically measuring or identifying words, numbers and symbols in the URL. In my personal experience, I use it to track and tag URLs or to make smart redirects happen from .htaccess. For this entry, I’ll focus on smart redirects so as to keep your brain juices flowing. Here’s a scenario: I have a client and some other ‘SEO web development company’ did…

    SEO Hacker Blogin SEO How To's- 35 readers -