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[std] EReg.matched: clarify doc and fix return type #12942

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[std] EReg.matched: clarify doc and fix return type #12942

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10 changes: 7 additions & 3 deletions std/EReg.hx
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Original file line number Diff line number Diff line change
Expand Up @@ -66,11 +66,15 @@ class EReg {
`this.matchSub`, and then operates on the String of that operation.

The index `n` corresponds to the n-th set of parentheses in the pattern
of `this` EReg. If no such sub-group exists, the result is unspecified.
of `this` EReg. If `n` equals 0, the whole matched substring is returned.

If `n` equals 0, the whole matched substring is returned.
If the sub-group `n` was defined in the pattern but did not participate
in the match, `null` is returned.

If no sub-group with index `n` exists in the pattern, the result is
unspecified.
**/
public function matched(n:Int):String {
public function matched(n:Int):Null<String> {
return null;
}

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