feat(main): add regExpFlag option

Author: isuke

README.adoc

@@ -346,6 +346,10 @@ link:https://github.com/isuke/git-consistent/blob/master/sample_type_list.adoc[s
 | (`type: branch` only) number of values to retrieve from the match specified by `regExp`
 | string
 
+| `regExpFlag`
+| (`type: branch` only) `regExp`'s falg
+| `i`
+
 | `rules`
 | input value format rules
 | Object

lib/main.js

@@ -68,7 +68,7 @@ const getCurrentBranchName = () => {
 
 const branchText = (_term, definition) => {
   const currentBranchName = getCurrentBranchName()
-  const regExp = new RegExp(definition.regExp)
+  const regExp = new RegExp(definition.regExp, definition.regExpFlag)
   const matchNum = definition.regExpMatchNum || 1
   const match = currentBranchName.match(regExp)
   const value = match ? match[matchNum] : ''