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The following seems to do what you want and works with both recent versions of bash and Korn shells with a version of 1993 or later:
#!/bin/bash
arr=("File_23_23.csv" "File_112_156.csv"...

What shell are you using?
What OS are you using?

You've got a couple of problems. First, you define pattern and pattern1, but you never use pattern1. And, second, these are filename matching patterns, not regular expressions. So the filename...