This package provides a x/text/transform.Transformer implementation that replaces text
package main
import (
"io"
"os"
"regexp"
"github.com/icholy/replace"
)
func main() {
f, _ := os.Open("file")
defer f.Close()
r := replace.Chain(f,
// simple replace
replace.String("foo", "bar"),
replace.Bytes([]byte("thing"), []byte("test")),
// remove all words that start with baz
replace.Regexp(regexp.MustCompile(`baz\w*`), nil),
// surround all words with parentheses
replace.RegexpString(regexp.MustCompile(`\w `), "($0)"),
// increment all numbers
replace.RegexpStringFunc(regexp.MustCompile(`\d `), func(match string) string {
x, _ := strconv.Atoi(match)
return strconv.Itoa(x 1)
}),
)
_, _ = io.Copy(os.Stdout, r)
}
RegexpTransformer
is stateful and cannot be used concurrently.- The
replace
functions should not save or modify any[]byte
parameters they recieve. - If a match is longer than
MaxMatchSize
it may be skipped (Default 2kb). - For better performance, reduce the
MaxMatchSize
size to the largest possible match. - Do not use with transform.Chain, see golang/go#49117.