Handling the Error "preg_split(): Unknown modifier '=' " When Running the Fetch Emails Task Manually

Overview

When running the fetch emails (POP3/IMAP) task manually, the error "preg_split(): Unknown modifier '=' " may appear. This article provides information on how to fix this issue.

Information

The error may appear when the"Pattern match" option on a configured Breakline is set to Yes but you did not specify a regular expression pattern.

You would only set this option to Yes if you intend to use a regular expression pattern in place of the "breakline" text or pattern in the "Breakline text to truncate at" field. Else, it should be kept to No. 

A regular expression is a pattern describing a certain amount of text, such as a particular character, words, or patterns of characters. The term ‘Regular Expressions’ is used as regex or regexp in common use. The regex is used to validate the input for a field. For full details regarding these functions, we may refer to the link here. 

Prerequisite

• Admin access with "update Email breaklines rules" permission.

Solution

To resolve this issue, follow these steps to update the breakline:

1. Log in to the admin control panel.
2. From the Home tab, select Email Parser and click Breaklines.
3. Click to open the relevant Breakline from the list.
4. Select No on the Pattern match option.
5. Click Save.