line 2) (Do you need to predeclare print?) syntax error at typo.pl line 3, near “print “$message ” Global symbol “message” requires explicit package name at typo.pl line 3. Backslash found where operator expected at typo.pl line 3, near “$message ” (Missing operator before ?) Bareword “n” not allowed while “strict subs” in use at typo.pl line 3. String found where operator expected at typo.pl line 3, at end of line (Missing semicolon on previous line?) Can’t find string terminator ‘”‘ anywhere before EOF at typo.pl line 3. Seven error messages from one typo! Let’s concentrate on the first error and ignore the rest for now. The first error complains about a scalar on line 3 instead of a typo. Luckily, we get a hint about the error: Might be a runaway multi-line “” string starting on line 2 This suggests paying special attention to the use of quote marks on line 2, where we find the string delimited by a double quote (”) and a single quote (’). String delimiters must match at the beginning and end. Since there are no interpolated variables or digraphs in this string, either kind of quote will work, as long as we use the same one at each end of the string. Handle only the first warning or error message output by Perl; don’t bother reading the others, just recompile. Error messages after the first one may be a cascade effect and therefore may be eliminated by removing the cause of the first message. It’s usually not worth the time to analyze each message to determine whether this is the case. 8.1.5 Transposition Regular expressions provide a fertile breeding ground for typos. Suppose you want to match and save the last string of letters preceded by white space on a line: /s([a-z])+$/i Looks right, eh? Try it on an example, though: while () { print “Match = $1n” if /s([a-z])+$/i; } __END__ The boy stood on the burning duck
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