strrpos

Description

Finds the numeric position of the last instance of a character or string within another string.

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 integer strrpos( string haystack, string needle, integer offset )

Finds the numeric position of the last instance of needle in the haystack string.

haystack is the string to search through.
needle is the substring to match in haystack.
offset is the index (starting at 0) of the string to start at.

Example

{strrpos('Sailthru and Zephyr are fun and games','and')}   =  28

{strrpos('Sailthru and Zephyr are fun and games','and',20)}   =  9

Remove Query Parameters from URLs in a Feed

Use Case: You have URLs in a data feed that have query string parameters appended that need to be removed in order to make use of the Sailthru auto-append parameters instead. Used in conjunction with either strrpos() or strpos().

Zephyr: In the Setup:

{foreach content as c}
{if contains(c.url, "?")}
{c.url = substr(c.url,0,strrpos(c.url,"?"))}
{c.url}<br/>
{/foreach}

Output: Since the first items in both the “Media” and eComm feeds have a query parameter,

http://example.com/media/stephen-king-new-book/?utm_source=web

becomes

http://example.com/media/stephen-king-new-book/

And

http://example.com/fiction/tokillamockingbird/?utm_medium=site

becomes

http://example.com/fiction/tokillamockingbird/

Explanation: This script uses a loop to check every piece of content in the feed. Within the loop, there’s a conditional “if” statement, and if a given URL contains a “?” (i.e., it has query parameter), the URL value gets reassigned. Using substr(), we take a sub-string of the URL, starting at the beginning of the string (i.e. position 0), and ending at the position before the “?”. Since the substr() functions need a numerical “end point,” using strrpos() (aka, string reverse position), we’re able to find the numerical placement of the “?”. This allows us to retrieve the necessary sub-string, which is everything from the beginning of the URL up until before the “?”.

Create a Local Variable Based on Email Address

Use Case: You want to create a local variable of each user’s email domain to pull into. You see that you can do this with a combination of subtr() and strrpos().

Zephyr: Setup:

{domainName = substr(email,strrpos(email,"@")+1)}

HTML:

<p>Hi there! What are your experiences using {domainName}?</p>

Output:

Email = email@example.com

Hi there! What are your experiences using example.com?

Explanation: This script uses the subtr() function to isolate a user’s email domain for display in a template. Using substr(), we take a sub-string of the email, starting at the position after the “@”. Since the substr() functions need a numerical “end point,” strrpos() (aka, string reverse position) is used to find the numerical placement of the “@”, and using the mathematical “+” operator, add one the the value of the position. This allows us to retrieve the