[Golang] Filename Globbing Summary
source link: http://siongui.github.io/2017/04/25/go-file-name-glob-summary/
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[Golang] Filename Globbing Summary
April 25, 2017
Filename globbing are found in several places in Go standard library.
I want to how the it works, so I use a small example to test. I have the two txt files as follows:
testdir/a.txt textdir/subdir/b.txt
Use testdir/*.txt as pattern in filepath.Glob:
package main
import (
"path/filepath"
"fmt"
)
func main() {
matches, err := filepath.Glob("testdir/*.txt")
if err != nil {
panic(err)
}
fmt.Println(matches)
}
The output:
[testdir/a.txt]
As expected, * does not match sub-directory. How about **? Modify the pattern from testdir/*.txt to testdir/**.txt, and the output is:
[testdir/a.txt]
The output is the same. ** does not match zero or more directories [3].
If sub-directory depth is known, we can still match file in sub-directory. For example, modify the pattern from testdir/*.txt to testdir/*/*.txt [4]. The output is:
[testdir/subdir/b.txt]
The file in sub-directory is matched.
My summary
- * does not match sub-directories.
- ** is not supported, i.e., does not match zero or more directories.
- If depth of sub-directories is known, sub-directories can be matched with workaround.
- There are third-party packages which provides more complete glob features [5].
Tested on:
- Ubuntu Linux 17.04
- Go 1.8.1
References:
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