Regular Expressions 101

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/
^((?!\b(bobo|cu|porra|Pinto)\b).)+$
/
gm
^ asserts position at start of a line
1st Capturing Group
((?!\b(bobo|cu|porra|Pinto)\b).)+
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data
Negative Lookahead
(?!\b(bobo|cu|porra|Pinto)\b)
Assert that the Regex below does not match
\b assert position at a word boundary: (^\w|\w$|\W\w|\w\W)
2nd Capturing Group
(bobo|cu|porra|Pinto)
1st Alternative
bobo
bobo
matches the characters bobo literally (case sensitive)
2nd Alternative
cu
cu
matches the characters cu literally (case sensitive)
3rd Alternative
porra
porra
matches the characters porra literally (case sensitive)
4th Alternative
Pinto
Pinto
matches the characters Pinto literally (case sensitive)
\b assert position at a word boundary: (^\w|\w$|\W\w|\w\W)
. matches any character (except for line terminators)
$ asserts position at the end of a line
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String

Code Generator

Generated Code

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Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report.
For a full regex reference for Perl, please visit: http://perldoc.perl.org/perlre.html