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http://www.lunametrics.com/regex-book/Regular-Expressions-Google-Analytics.pdf - 0 views
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For me the regular expression showed up in the excellent Yoast SEO plugin for Wordpress. I needed to redirect a URL that had parameters, like this:
http://conversionsciences.com/conversion-upside-report/?t=10000&v=344&x=250
To do this, I could not use a regular redirect, as everything after the ? would be stripped away. I needed to use a Regular Expression Redirect. However, this sort of thing -- using query parameters -- wasn't covered in any of the Yoast documentation.
This article gave me the hint I needed, and the technique that ended up working. To summarize, I used the following regular expression to match my URL with the parameters:
^\/conversion-upside-report($|\/.*$)
The parentheses save the matching contents into a variable, which I can access using $1 in the new URL, like this:
resources/conversion-rate-optimization-calculator/upside-report/$1
It worked great. Give it a try: http://conversionsciences.com/conversion-upside-report/?t=10000&v=344&x=250
Thanks to Himanshu.