petersomogyi commented on pull request #3568:
URL: https://github.com/apache/hbase/pull/3568#issuecomment-894272227
Using `=` or `=~` is handled differently. The first uses pattern matching
the latter uses regex.
```
bash-5.1$ export PATCH_BRANCH=branch-1; if [[ "${PATCH_BRANCH}" = branch-1*
]]; then echo "true"; fi
true
bash-5.1$ export PATCH_BRANCH=branch-1.2; if [[ "${PATCH_BRANCH}" =
branch-1* ]]; then echo "true"; fi
true
bash-5.1$ export PATCH_BRANCH=branch-2; if [[ "${PATCH_BRANCH}" = branch-1*
]]; then echo "true"; fi
bash-5.1$ export PATCH_BRANCH=branch-; if [[ "${PATCH_BRANCH}" = branch-1*
]]; then echo "true"; fi
bash-5.1$ export PATCH_BRANCH=branch-1; if [[ "${PATCH_BRANCH}" =~ branch-1*
]]; then echo "true"; fi
true
bash-5.1$ export PATCH_BRANCH=branch-1.2; if [[ "${PATCH_BRANCH}" =~
branch-1* ]]; then echo "true"; fi
true
bash-5.1$ export PATCH_BRANCH=branch-2; if [[ "${PATCH_BRANCH}" =~ branch-1*
]]; then echo "true"; fi
true
bash-5.1$ export PATCH_BRANCH=branch-; if [[ "${PATCH_BRANCH}" =~ branch-1*
]]; then echo "true"; fi
true
bash-5.1$ export PATCH_BRANCH=branch-1; if [[ "${PATCH_BRANCH}" =~
branch-1.* ]]; then echo "true"; fi
true
bash-5.1$ export PATCH_BRANCH=branch-1.2; if [[ "${PATCH_BRANCH}" =~
branch-1.* ]]; then echo "true"; fi
true
bash-5.1$ export PATCH_BRANCH=branch-2; if [[ "${PATCH_BRANCH}" =~
branch-1.* ]]; then echo "true"; fi
bash-5.1$ export PATCH_BRANCH=branch-; if [[ "${PATCH_BRANCH}" =~ branch-1.*
]]; then echo "true"; fi
```
Based on this I can simplify the code. :)
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