# Regexp ignore case option

**URL:** <https://www.ruby-forum.com/t/regexp-ignore-case-option/120072>\
**Category:** Development\
**Created:** [November 13, 2007, 3:16pm UTC](https://www.ruby-forum.com/t/regexp-ignore-case-option/120072 "2007-11-13T15:16:54Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![SASADA\_Koichi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/f1d935/32.png) [@SASADA\_Koichi](https://www.ruby-forum.com/u/SASADA_Koichi)\
**Post date:** [November 13, 2007, 3:16pm UTC](https://www.ruby-forum.com/t/regexp-ignore-case-option/120072/1 "2007-11-13T15:16:54Z")

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e$B!!e(B1.9 e$B$Ge(B test-all e$B$r$9$k$H$3$s$J\<:GT$r$7$^$9!%e(B

1. Failure:  
test\_s\_new(TC\_IPAddr) [/home/ko1/ruby/trunk/lib/ipaddr.rb:580]:  
Exception raised:  
Class:   
Message: \<“invalid address”\>  
—Backtrace—  
/home/ko1/ruby/trunk/lib/ipaddr.rb:513:in `raise' /home/ko1/ruby/trunk/lib/ipaddr.rb:513:in`in6\_addr’  
/home/ko1/ruby/trunk/lib/ipaddr.rb:473:in `initialize' /home/ko1/ruby/trunk/lib/ipaddr.rb:581:in`new’  
/home/ko1/ruby/trunk/lib/ipaddr.rb:581:in `block in test_s_new' /home/ko1/ruby/trunk/lib/ipaddr.rb:580:in`test\_s\_new’

* * *

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p(/[^0-9a-f:]/i =~ “3FFE:505:ffff::/48”)  
#=\> 1

e$B$H$J$k$?$a$N$h$&$G$9$,!$$I$&$7$?$b$s$G$7$g$&$+!%e(B/[^0-9a-f:]/i  
e$B$re(B  
/[^0-9a-fA-F:]/ e$B$K$Y$?$K=q$1$P!$$^$!@.8y$O$9$k$s$G$9$,!%e(B

---

<div class="post-metadata">

**Author:** ![SASADA\_Koichi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/f1d935/32.png) [@SASADA\_Koichi](https://www.ruby-forum.com/u/SASADA_Koichi)\
**Post date:** [November 13, 2007, 5:27pm UTC](https://www.ruby-forum.com/t/regexp-ignore-case-option/120072/2 "2007-11-13T17:27:48Z")

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e$B$^$D$b$He(B e$B$f$-$R$m$G$9e(B

In message “Re: [ruby-dev:32267] regexp ignore case option”  
on Tue, 13 Nov 2007 23:15:26 +0900, SASADA Koichi [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
writes:

|e$B!!e(B1.9 e$B$Ge(B test-all e$B$r$9$k$H$3$s$J\<:GT$r$7$^$9!%e(B

e$B$3$l$O!"e(B

> 1. Failure:  
> test\_ruby\_dev\_31309(TestRegexp)  
> [/home/ko1/ruby/trunk/test/ruby/test\_regexp.rb:29]:  
> \<“Ruby”\> expected but was  
> \<“-uby”\>.

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e$B\<1$7$F$$$^$9$,!"$J$+$J$+\<j$,=P$;$^$;$s!#e(B