lookbehind for ctRegex
[trivial] Remove documentation quick link to deprecated indexOf

indexOf was recently made undocumented to go along with its deprecation.  The handwritten quick index link remained though.
Merge pull request #1485 from blackwhale/ctr-lookback

Lookbehind in ctRegex
Merge pull request #1524 from eco/patch-4

[trivial] Remove documentation quick link to deprecated indexOf