可能包含[img][\img]的字符串
截取后的字符串
bbb[img]ccc[img]ddd[\img]eee[\img]
[img]ddd[\img]eee[\img]
abc
null
package main import ( "fmt" "strings" ) func main() { var s string fmt.Scan(&s) idx1:=strings.LastIndex(s,"[img]") idx2:=strings.LastIndex(s,"[\\img]") if idx1==-1||idx2==-1||idx1>idx2{ fmt.Print("null") }else{ fmt.Print(s[idx1:idx2+6]) } }
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