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Re^2: Detecting if a string is a regular expression

by LanX (Canon)
on Jan 12, 2013 at 11:03 UTC ( #1013030=note: print w/ replies, xml ) Need Help??

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  1. or download this
    $ perl -ple ' $_ = eval "sub { /$_/ }" ? "OK\n" : "$@" '
    a
    ...
    
    a()
    OK
    
  2. or download this
    $ perl -ple ' $_ = eval "sub { /$_/ }" ? "OK\n" : "$@" '
    a[$]
    OK
    
  3. or download this
    $ perl -e ' "abc" =~ /a[$]/ '
    Unmatched [ in regex; marked by <-- HERE in m/a[ <-- HERE 5.010000/ at
    + -e line 1.
    
  4. or download this
    $ perl -e 'sub {"aaa" =~ /a[$]/}'
    $ perl -e '"aaa" =~ /a[$]/'
    Unmatched [ in regex; marked by <-- HERE in m/a[ <-- HERE 5.010000/ at
    + -e line 1.
    $ perl -ce '"aaa" =~ /a[$]/'
    -e syntax OK
    
  5. or download this
    perl -E 'say q(a$) =~ q(a[$]) '
    1
    

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