# "ab".rindex(/ab/, 0) =\> nil

**URL:** <https://www.ruby-forum.com/t/ab-rindex-ab-0-nil/109875>\
**Category:** Development\
**Created:** [July 19, 2007, 8:14pm UTC](https://www.ruby-forum.com/t/ab-rindex-ab-0-nil/109875 "2007-07-19T20:14:33Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Tanaka\_A](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/c67d28/32.png) [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Post date:** [July 19, 2007, 8:14pm UTC](https://www.ruby-forum.com/t/ab-rindex-ab-0-nil/109875/1 "2007-07-19T20:14:33Z")

</div>

“ab”.rindex(/ab/, 0) e$B$,e(B nil e$B$K$J$k$N$O0U?^$5$l$?5sF0$G$7$g$&e(B  
e$B$+!#e(B

% ./ruby -ve ‘p “ab”.rindex(/ab/, 0)’  
ruby 1.9.0 (2007-07-19 patchlevel 0) [i686-linux]  
nil

1.8 e$B$@$He(B 0 e$B$K$J$j$^$9!#e(B

% ruby-1.8 -ve ‘p “ab”.rindex(/ab/, 0)’  
ruby 1.8.6 (2007-07-17 patchlevel 5000) [i686-linux]  
0

e$B$^$?!“e(B"ab”.rindex(“ab”, 0) e$B$be(B 0 e$B$K$J$j$^$9!#e(B

% ./ruby -e ‘p “ab”.rindex(“ab”, 0)’  
0