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#218 — S15.10.4.1_A3_T1 ~ S15.10.4.1_A3_T5 and S15.10.4.1_A4_T2, T3, T5, empty String RegExp pattern source is "(:?)"

• bug_id: 218
• creation_ts: 2011-10-20 21:18:00 -0700
• short_desc: S15.10.4.1_A3_T1 ~ S15.10.4.1_A3_T5 and S15.10.4.1_A4_T2, T3, T5, empty String RegExp pattern source is "(:?)"
• delta_ts: 2012-01-12 16:40:19 -0800
• product: Test262
• component: ECMA-262 Tests
• version: unspecified
• rep_platform: All
• op_sys: All
• bug_status: RESOLVED
• resolution: FIXED
• priority: Normal
• bug_severity: enhancement
• everconfirmed: true
• reporter: Yusuke Suzuki
• assigned_to: Dave Fugate

---

• commentid: 502
• comment_count: 0
• attachid: 8
• who: Yusuke Suzuki
• bug_when: 2011-10-20 21:18:27 -0700

Created attachment 8
patch for this issue

According to section 15.10.4.1
http://es5.github.com/#x15.10.4.1

let P be the empty String if pattern is undefined
then, P is empty String "".

And,
If P is the empty String, this specification can be met by letting S be "(?:)".
then, S is string "(?:)".

And,
The source property of the newly constructed object is set to S.

So, new RegExp().source is "(:?)".

---

• commentid: 595
• comment_count: 1
• who: Dave Fugate
• bug_when: 2012-01-12 16:40:19 -0800

Exceptional spot Yusuke, and all browsers I tried this on get it wrong. I've added a regression to ensure RegExp().source!==="" and this will be a part of Microsoft's next contribution to test262.

While 15.10.4.1 recommends empty RegExp's source properties be "(?:)", the wordage doesn't actually require this. Consequently, I've simply removed the checks for '*.source === ""' in the Sputnik tests.