Is it a bug or what?

[moderator1983]

Please find the attached VI, its pretty simple function but its behaviour is unexpected.

[Taki1999 · Accepted solution]

Probably not a bug.  Maybe a little lacking in the documentation area.

Don't use \ codes display in the Pattern input.  Use a normal string.

Your first pattern should be [\r][\n]\*\*Stop\*\*.

Your second pattern should be \*\*Stop\*\*.

[moderator1983]

Thank you. 

[g_Ricky]

It's not a bug! The Match Pattern function allows to use some special characters such as the "*" that are interpretated from the function like "the rest of the string". If you want the function works properly before these specials characters you have to insert a "\" character to indicate to the function that that is a normal char. See your VI modified to understand how the function works.