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Solution according to author's comment
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Hi I have a regex which works fine on <br />
<br />
ABCDE123456X &nbsp;- /LYBLA[0-9]{6}X/i (Fixed ABCDE, followed by 6 digits, and a fixed X.<br />
<br />
I need to change this to be able to use a 7th digit instead of the final fixed X as well as the original format, for example<br />
<br />
ABCDE1234567 and ABCDE987654X<br />
<br />
Please advise
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Hi I have a regex which works fine on 

ABCDE123456X  - /LYBLA[0-9]{6}X/i (Fixed ABCDE, followed by 6 digits, and a fixed X.

I need to change this to be able to use a 7th digit instead of the final fixed X as well as the original format, for example

ABCDE1234567 and ABCDE987654X

Please advise

REGEX with 2 formats

A regular expression ("regex") is a sequence of characters that define a search pattern, mainly for use in pattern matching with strings, or string matching, i.e. "find and replace"-like operations. Regular expression processors are found in several search engines, search and replace dialogs of several word processors and text editors, and in the command lines of text processing utilities, such as sed and AWK. Many programming languages provide regular expression capabilities, some built-in, for example Perl, JavaScript, Ruby, AWK, and Tcl, and others via a standard library, for example .NET languages, Java, Python and C++ (since C++11). Most other languages offer regular expressions via a library.