| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/go-playground/locales | |
| golang.org/x/text/unicode/cldr | Package cldr provides a parser for LDML and related XML formats. |
| log | Package log implements a simple logging package. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| os/exec | Package exec runs external commands. |
| regexp | Package regexp implements regular expression search. |
| sort | Package sort provides primitives for sorting slices and user-defined collections. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| text/template | Package template implements data-driven templates for generating textual output. |