So, my program can accept strings like:

• @vS050_A1_0002「Hello!」
• @v2124_A4_005「Bye, Bye」
• @k789_S3_100「Lorem imsum」

and also a string without a version number:

• Vivamus blandit et nibh nec placerat.
• In hac habitasse platea dictumst. Suspendisse potenti.

I tried to write a regular expression to remove the version from the string. And it came out something like this: ^[^「]* . It finds a match for the version and successfully replaces it with an empty string. But the problem is that it also works on strings without a version. That is, it deletes the entire line without the version.
So, my question is, how do I write a regular expression that only works with sentences that start with a version?
Example: A program receives 2 strings. The first @vS050_A1_0002「Hello!」 and the second Example2 string2 . The result after the regular expression should be 「Hello!」 and Example2 string2 .