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import re, macros
template `/` (s: string, flagSym: expr{sym}): expr {.immediate.} = 

macro `/` (s: string, flagSym: expr): expr {.immediate.} =
    var flagList = {reStudy}
    # here the compiler complains `i` is undefined
    let flags = $flagSym
    # if flags.contains('i'):
    #     echo("here")
    #     flagList.add(reIgnoreCase)
    re(s, flagList)

    result = newCall("re", s, parseExpr"{reStudy}")
 
let re1 = "  "/i
 
echo("  ".match(re1))

1
2		import re, macros
3	-	template `/` (s: string, flagSym: expr{sym}): expr {.immediate.} =
3	+
4		macro `/` (s: string, flagSym: expr): expr {.immediate.} =
5		var flagList = {reStudy}
6		# here the compiler complains `i` is undefined
7		let flags = $flagSym
8		# if flags.contains('i'):
9		# echo("here")
10		# flagList.add(reIgnoreCase)
11	-	re(s, flagList)
11	+
12		result = newCall("re", s, parseExpr"{reStudy}")
13
14		let re1 = " "/i
15
16		echo(" ".match(re1))