Go语言学习日记【二十四】将字符串中连续多个空格压缩为一个

package  main

import (
  "fmt"
  "regexp"
)

func main() {
  oldstr := "I                have   a dream"
  fmt.Println(oldstr)
  newstr := DeleteExtraSpace(oldstr)
  fmt.Println(newstr)
}

//删除字符串中的多余空格，有多个空格时，仅保留一个空格
func DeleteExtraSpace(s string) string {
  regstr := "\\s{2,}"
  reg, _ := regexp.Compile(regstr)
  tmpstr := make([]byte, len(s))
  copy(tmpstr, s)
  spc_index := reg.FindStringIndex(string(tmpstr))
  for len(spc_index) > 0 {
    tmpstr = append(tmpstr[:spc_index[0]+1], tmpstr[spc_index[1]:]...)
    spc_index = reg.FindStringIndex(string(tmpstr))
  }
  return string(tmpstr)
}