Add missing symbols to regex (#20383)

* Add missing attribute to jsre

* Add missing attribute to jsre

changelog.md

@@ -69,6 +69,7 @@
   in `jscore` for JavaScript targets.
 - Added `UppercaseLetters`, `LowercaseLetters`, `PunctuationChars`, `PrintableChars` sets to `std/strutils`.
 - Added `complex.sgn` for obtaining the phase of complex numbers.
+- Added [`jsre.hasIndices`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/hasIndices)
 
 [//]: # "Deprecations:"
 - Deprecated `selfExe` for Nimscript.
@@ -137,10 +138,10 @@
   added to make this work explicitly, and a warning is generated in the case
   where it is implicit. This behavior only applies to templates, redefinition
   is generally disallowed for other symbols.
-  
+
 - A new form of type inference called [top-down inference](https://nim-lang.github.io/Nim/manual_experimental.html#topminusdown-type-inference)
   has been implemented for a variety of basic cases. For example, code like the following now compiles:
-  
+
   ```nim
   let foo: seq[(float, byte, cstring)] = @[(1, 2, "abc")]
   ```
@@ -153,7 +154,7 @@
 
 - The `gc` switch has been renamed to `mm` ("memory management") in order to reflect the
   reality better. (Nim moved away from all techniques based on "tracing".)
-  
+
 - Defines the `gcRefc` symbol which allows writing specific code for the refc GC.
 
 - `nim` can now compile version 1.4.0 as follows: `nim c --lib:lib --stylecheck:off compiler/nim`,

lib/js/jsre.nim

@@ -20,6 +20,7 @@ type RegExp* = ref object of JsRoot
   lastParen*: cstring    ## Ditto.
   leftContext*: cstring  ## Ditto.
   rightContext*: cstring ## Ditto.
+  hasIndices*: bool      ## https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/hasIndices
 
 
 func newRegExp*(pattern: cstring; flags: cstring): RegExp {.importjs: "new RegExp(@)".}