diff --git a/docs/extras-string/cases.md b/docs/extras-string/cases.md
new file mode 100644
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@@ -0,0 +1,310 @@
+---
+sidebar_position: 3
+id: 'cases'
+title: 'cases syntax'
+---
+
+## Import `cases` syntax
+
+```scala mdoc
+import extras.strings.syntax.cases._
+```
+Or
+```scala
+import extras.strings.syntax.all._
+```
+
+## Case Change for `String`
+
+### `String` to `PascalCase`
+
+```scala mdoc
+"Abc".toPascalCase
+
+"AbcDefGhi".toPascalCase
+
+"abcDefGhi".toPascalCase
+
+"abc".toPascalCase
+
+"ABC".toPascalCase
+
+"Abc_Def_Ghi".toPascalCase
+
+"abc_def_ghi".toPascalCase
+
+"abc__def__ghi".toPascalCase
+
+"Abc-Def-Ghi".toPascalCase
+
+"abc-def-ghi".toPascalCase
+
+"abc--def--ghi".toPascalCase
+
+"Abc Def Ghi".toPascalCase
+
+"abc def ghi".toPascalCase
+
+"AbcDef_Ghi_jkl-Mno-pqr Stu vwx".toPascalCase
+
+"AbcDef__Ghi___jkl--Mno---pqr  Stu   vwx".toPascalCase
+```
+
+
+### `String` to one `PascalCase`
+```scala mdoc
+"Abc".toOnePascalCase
+
+"AbcDefGhi".toOnePascalCase
+
+"abcDefGhi".toOnePascalCase
+
+"abc".toOnePascalCase
+
+"ABC".toOnePascalCase
+
+"Abc_Def_Ghi".toOnePascalCase
+
+"abc_def_ghi".toOnePascalCase
+
+"abc__def__ghi".toOnePascalCase
+
+"Abc-Def-Ghi".toOnePascalCase
+
+"abc-def-ghi".toOnePascalCase
+
+"abc--def--ghi".toOnePascalCase
+
+"Abc Def Ghi".toOnePascalCase
+
+"abc def ghi".toOnePascalCase
+
+"AbcDef_Ghi_jkl-Mno-pqr Stu vwx".toOnePascalCase
+
+"AbcDef__Ghi___jkl--Mno---pqr  Stu   vwx".toOnePascalCase
+```
+
+
+### `String` to `camelCase`
+```scala mdoc
+"Abc".toCamelCase
+
+"AbcDefGhi".toCamelCase
+
+"abcDefGhi".toCamelCase
+
+"abc".toCamelCase
+
+"ABC".toCamelCase
+
+"Abc_Def_Ghi".toCamelCase
+
+"abc_def_ghi".toCamelCase
+
+"abc__def__ghi".toCamelCase
+
+"Abc-Def-Ghi".toCamelCase
+
+"abc-def-ghi".toCamelCase
+
+"abc--def--ghi".toCamelCase
+
+"Abc Def Ghi".toCamelCase
+
+"abc def ghi".toCamelCase
+
+"AbcDef_Ghi_jkl-Mno-pqr Stu vwx".toCamelCase
+
+"AbcDef__Ghi___jkl--Mno---pqr  Stu   vwx".toCamelCase
+```
+
+
+### `String` to `Snake_Case`
+```scala mdoc
+"Abc".toSnakeCase
+
+"AbcDefGhi".toSnakeCase
+
+"abcDefGhi".toSnakeCase
+
+"abc".toSnakeCase
+
+"ABC".toSnakeCase
+
+"Abc_Def_Ghi".toSnakeCase
+
+"abc_def_ghi".toSnakeCase
+
+"ABC_DEF_GHI".toSnakeCase
+
+"abc-def-ghi".toSnakeCase
+
+"Abc-Def-Ghi".toSnakeCase
+
+"ABC-DEF-GHI".toSnakeCase
+
+"abc def ghi".toSnakeCase
+
+"Abc Def Ghi".toSnakeCase
+
+"ABC DEF GHI".toSnakeCase
+```
+
+
+### `String` to `SNAKE_UPPER_CASE`
+```scala mdoc
+"Abc".toSnakeUpperCase
+
+"AbcDefGhi".toSnakeUpperCase
+
+"abcDefGhi".toSnakeUpperCase
+
+"abc".toSnakeUpperCase
+
+"ABC".toSnakeUpperCase
+
+"Abc_Def_Ghi".toSnakeUpperCase
+
+"abc_def_ghi".toSnakeUpperCase
+
+"ABC_DEF_GHI".toSnakeUpperCase
+
+"abc-def-ghi".toSnakeUpperCase
+
+"Abc-Def-Ghi".toSnakeUpperCase
+
+"ABC-DEF-GHI".toSnakeUpperCase
+
+"abc def ghi".toSnakeUpperCase
+
+"Abc Def Ghi".toSnakeUpperCase
+
+"ABC DEF GHI".toSnakeUpperCase
+```
+
+
+### `String` to `snake_lower_case`
+```scala mdoc
+"Abc".toSnakeLowerCase
+
+"AbcDefGhi".toSnakeLowerCase
+
+"abcDefGhi".toSnakeLowerCase
+
+"abc".toSnakeLowerCase
+
+"ABC".toSnakeLowerCase
+
+"Abc_Def_Ghi".toSnakeLowerCase
+
+"abc_def_ghi".toSnakeLowerCase
+
+"ABC_DEF_GHI".toSnakeLowerCase
+
+"abc-def-ghi".toSnakeLowerCase
+
+"Abc-Def-Ghi".toSnakeLowerCase
+
+"ABC-DEF-GHI".toSnakeLowerCase
+
+"abc def ghi".toSnakeLowerCase
+
+"Abc Def Ghi".toSnakeLowerCase
+
+"ABC DEF GHI".toSnakeLowerCase
+```
+
+### `String` to `Kebab-Case`
+```scala mdoc
+"Abc".toKebabCase
+
+"AbcDefGhi".toKebabCase
+
+"abcDefGhi".toKebabCase
+
+"abc".toKebabCase
+
+"ABC".toKebabCase
+
+"Abc_Def_Ghi".toKebabCase
+
+"abc_def_ghi".toKebabCase
+
+"ABC_DEF_GHI".toKebabCase
+
+"abc-def-ghi".toKebabCase
+
+"Abc-Def-Ghi".toKebabCase
+
+"ABC-DEF-GHI".toKebabCase
+
+"abc def ghi".toKebabCase
+
+"Abc Def Ghi".toKebabCase
+
+"ABC DEF GHI".toKebabCase
+```
+
+
+### `String` to `KEBAB-UPPER-CASE`
+```scala mdoc
+"Abc".toKebabUpperCase
+
+"AbcDefGhi".toKebabUpperCase
+
+"abcDefGhi".toKebabUpperCase
+
+"abc".toKebabUpperCase
+
+"ABC".toKebabUpperCase
+
+"Abc_Def_Ghi".toKebabUpperCase
+
+"abc_def_ghi".toKebabUpperCase
+
+"ABC_DEF_GHI".toKebabUpperCase
+
+"abc-def-ghi".toKebabUpperCase
+
+"Abc-Def-Ghi".toKebabUpperCase
+
+"ABC-DEF-GHI".toKebabUpperCase
+
+"abc def ghi".toKebabUpperCase
+
+"Abc Def Ghi".toKebabUpperCase
+
+"ABC DEF GHI".toKebabUpperCase
+```
+
+### `String` to `kebab-lower-case`
+```scala mdoc
+"Abc".toKebabLowerCase
+
+"AbcDefGhi".toKebabLowerCase
+
+"abcDefGhi".toKebabLowerCase
+
+"abc".toKebabLowerCase
+
+"ABC".toKebabLowerCase
+
+"Abc_Def_Ghi".toKebabLowerCase
+
+"abc_def_ghi".toKebabLowerCase
+
+"ABC_DEF_GHI".toKebabLowerCase
+
+"abc-def-ghi".toKebabLowerCase
+
+"Abc-Def-Ghi".toKebabLowerCase
+
+"ABC-DEF-GHI".toKebabLowerCase
+
+"abc def ghi".toKebabLowerCase
+
+"Abc Def Ghi".toKebabLowerCase
+
+"ABC DEF GHI".toKebabLowerCase
+```
+
diff --git a/docs/extras-string/numeric.md b/docs/extras-string/numeric.md
index 9962ee3b..b6edbd24 100644
--- a/docs/extras-string/numeric.md
+++ b/docs/extras-string/numeric.md
@@ -9,6 +9,10 @@ title: 'numeric syntax'
 ```scala mdoc
 import extras.strings.syntax.numeric._
 ```
+Or
+```scala
+import extras.strings.syntax.all._
+```
 
 ## `numeric` syntax for `Int`
 
diff --git a/docs/extras-string/strings.md b/docs/extras-string/strings.md
index 922a557e..6fda3a3d 100644
--- a/docs/extras-string/strings.md
+++ b/docs/extras-string/strings.md
@@ -9,6 +9,10 @@ title: 'strings syntax'
 ```scala mdoc
 import extras.strings.syntax.strings._
 ```
+Or
+```scala
+import extras.strings.syntax.all._
+```
 
 ## `commaWith(String)`