# MatchData#\[\] $B$J$I$,JV$9(B String

**URL:** <https://www.ruby-forum.com/t/matchdata-b-j-i-jv-9-b-string/158734>\
**Category:** Development\
**Created:** [January 27, 2009, 12:46pm UTC](https://www.ruby-forum.com/t/matchdata-b-j-i-jv-9-b-string/158734 "2009-01-27T12:46:30Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![KISHIMOTOS\_Makoto](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/8baadc/32.png) [@KISHIMOTOS\_Makoto](https://www.ruby-forum.com/u/KISHIMOTOS_Makoto)\
**Post date:** [January 27, 2009, 12:46pm UTC](https://www.ruby-forum.com/t/matchdata-b-j-i-jv-9-b-string/158734/1 "2009-01-27T12:46:30Z")

</div>

e$B$-$7$b$H$G$9e(B

MatchData e$B$Ne(B [] e$B$J$I$,JV$9e(B String e$B$K$D$$$F$J$N$G$9$,!“e(B  
chop! e$B$J$I$N$h$&$JI{:nMQ$N$”$k%a%=%C%I$r8F$V$H!"%(%i!\<$Ke(B  
e$B$J$i$:JQ99$G$-$?$+$N$h$&$K8+$($FJQ99$5$l$F$J$$$G$9$,!“e(B  
freeze e$B$7$F!J$”$k$$$Oe(B freeze e$B$5$l$?$+$N$h$&$J!K!“e(B  
e$BJQ99$7$h$&$H$7$?$i%(%i!\<$K$J$k%_%V%8%’%/%H$K$9$k$+!“e(B  
e$B$”$k$$$OI{:nMQ$K$h$kJQ99$,2DG=$J%_%V%8%’%/%H$K$9$k$+!”$Ne(B  
e$B$I$A$i$+$N$[$&$,$$$$$N$G$O$J$$$G$7$g$&$+!)e(B

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<div class="post-metadata">

**Author:** ![KISHIMOTOS\_Makoto](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/8baadc/32.png) [@KISHIMOTOS\_Makoto](https://www.ruby-forum.com/u/KISHIMOTOS_Makoto)\
**Post date:** [January 27, 2009, 2:15pm UTC](https://www.ruby-forum.com/t/matchdata-b-j-i-jv-9-b-string/158734/2 "2009-01-27T14:15:08Z")

</div>

e$B@.@%$G$9!#e(B

KISHIMOTO, Makoto wrote:

> e$B$-$7$b$H$G$9e(B
> 
> MatchData e$B$Ne(B [] e$B$J$I$,JV$9e(B String e$B$K$D$$$F$J$N$G$9$,!“e(B  
> chop! e$B$J$I$N$h$&$JI{:nMQ$N$”$k%a%=%C%I$r8F$V$H!"%(%i!\<$Ke(B  
> e$B$J$i$:JQ99$G$-$?$+$N$h$&$K8+$($FJQ99$5$l$F$J$$$G$9$,!“e(B  
> freeze e$B$7$F!J$”$k$$$Oe(B freeze e$B$5$l$?$+$N$h$&$J!K!“e(B  
> e$BJQ99$7$h$&$H$7$?$i%(%i!\<$K$J$k%_%V%8%’%/%H$K$9$k$+!“e(B  
> e$B$”$k$$$OI{:nMQ$K$h$kJQ99$,2DG=$J%_%V%8%’%/%H$K$9$k$+!”$Ne(B  
> e$B$I$A$i$+$N$[$&$,$$$$$N$G$O$J$$$G$7$g$&$+!)e(B

e$B$H$j$"$($:8=\>u$K$D$$$F@bL@$7$^$9$H!"e(B  
irb(main):001:0\>m = “abcde”.match(/(.)b(.)d(.)/)  
=\> #\<MatchData “abcde” 1:“a” 2:“c” 3:“e”\>  
irb(main):002:0\> m1 = m[1]  
=\> “a”  
irb(main):003:0\> m1.chop!  
=\> “”  
irb(main):004:0\> m1  
=\> “”  
irb(main):005:0\> m[1]  
=\> “a”  
e$B$H$$$&46$8$G!"e(B  
e$B$D$^$je(B m[1] e$B$OCf$KJ]B8$7$F$$$ke(B String  
e$B$N%3%T!\<$rJV$7$F$$$k$N$G$9!#e(B

e$B\<hF@85$Ne(B MatchedData e$B$N$3$H$r5$$K$;$:O.$j2s$;$k$N$G!“e(B  
e$B$3$l$O$3$l$G%a%j%C%H$,$”$k$H;W$$$^$9$,!"e(B  
e$B86K$rJV$7$?$[$&$,$$$$$H$$$&\<gD%$K@Z$jBX$($^$9!)e(B

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<div class="post-metadata">

**Author:** ![KISHIMOTOS\_Makoto](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/8baadc/32.png) [@KISHIMOTOS\_Makoto](https://www.ruby-forum.com/u/KISHIMOTOS_Makoto)\
**Post date:** [January 28, 2009, 3:59am UTC](https://www.ruby-forum.com/t/matchdata-b-j-i-jv-9-b-string/158734/3 "2009-01-28T03:59:18Z")

</div>

“NARUSE, Yui” wrote:

> > e$B$"$k$$$OI{:nMQ$K$h$kJQ99$,2DG=$J%\*%V%8%’%/%H$K$9$k$+!"$Ne(B  
> > =\> “”  
> > irb(main):005:0\> m[1]  
> > =\> “a”  
> > e$B$H$$$&46$8$G!"e(B  
> > e$B$D$^$je(B m[1] e$B$OCf$KJ]B8$7$F$$$ke(B String e$B$N%3%T!\<$rJV$7$F$$$k$N$G$9!#e(B
> 
> e$B\<hF@85$Ne(B MatchedData e$B$N$3$H$r5$$K$;$:O.$j2s$;$k$N$G!“e(B  
> e$B$3$l$O$3$l$G%a%j%C%H$,$”$k$H;W$$$^$9$,!"e(B  
> e$B86K$rJV$7$?$[$&$,$$$$$H$$$&\<gD%$K@Z$jBX$($^$9!)e(B

e$B$"!\<!#e(B[] e$B$O%3%T!\<$rJV$7$F$$$?$N$G$9$+!#e(B  
e$B:#=q$$$F$$$k%3!\<%I$G!"L@\<(E\*$Ke(B dup  
e$B$7$F$?$N$G$9$,!"M\>7W$@$C$?$o$1$G$9$M!#e(B

m = [‘abcde’, ‘a’, ‘c’, ‘e’]  
m1 = m[1]

e$B$H$7$?$H$-$H$NN`;w@-$+$i!"86K$rJV$7$?$[$&$,$$$$$h$&$J5$$b$7$^$9$,!“e(B  
e$B$=$&$9$k$H8=9T$N%3!\<%I$X$N1F6A$,Bg$-$=$&$G$9$N$G!”$3$NDs0F$O$R$C$3$a$^$9!#e(B