Re^4: How we can separate a backref from a digit?

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Re^5: How we can separate a backref from a digit? by Jenda (Abbot) on Mar 18, 2011 at 11:13 UTC
Unexpected to you. Variable interpolation happens before the regular expression is parsed and compiled so there is no difference between `$a=1; print "Match\n" if "aa1" =~ /^(a)\1$a$/; # not match!` [download] and `print "Match\n" if "aa1" =~ /^(a)\11$/; # not match!` [download] or `$a='\11'; print "Match\n" if "aa1" =~ /^(a)$a$/; # not match!` [download] If it did not work like this you could not build regular expressions out of parts stored in variables. Jenda Enoch was right! Enjoy the last years of Rome.	[reply] [d/l] [select]
Re^6: How we can separate a backref from a digit? by Serge314 (Acolyte) on Mar 21, 2011 at 10:29 UTC
I know that variable interpolation happens before the regular expression is parsed, but I think, Perl must report regarding using a backreference with incorrect number (11).	[reply]
Re^5: How we can separate a backref from a digit? by ikegami (Patriarch) on Mar 18, 2011 at 08:14 UTC
What would you expect `'\1'.'1'` to give?	[reply] [d/l]