Regular Expressions 101

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/
(['"])(?:(?!\1).)*or(?:(?!\1).)*\1(*SKIP)(*F)|\bor\b
/
gm
1st Alternative
(['"])(?:(?!\1).)*or(?:(?!\1).)*\1(*SKIP)(*F)
1st Capturing Group
(['"])
Match a single character present in the list below
['"]
'"
matches a single character in the list '" (case sensitive)
Non-capturing group
(?:(?!\1).)*
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
Negative Lookahead
(?!\1)
Assert that the Regex below does not match
\1 matches the same text as most recently matched by the 1st capturing group
. matches any character (except for line terminators)
or
matches the characters or literally (case sensitive)
Non-capturing group
(?:(?!\1).)*
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
Negative Lookahead
(?!\1)
Assert that the Regex below does not match
\1 matches the same text as most recently matched by the 1st capturing group
. matches any character (except for line terminators)
\1 matches the same text as most recently matched by the 1st capturing group
(*SKIP) acts like (*PRUNE), except that if the pattern is unanchored, the bumpalong advance is not to the next character, but to the position in the subject where (*SKIP) was encountered
(*F) shorthand for (*FAIL)
2nd Alternative
\bor\b
\b assert position at a word boundary: (^\w|\w$|\W\w|\w\W)
or
matches the characters or literally (case sensitive)
\b assert position at a word boundary: (^\w|\w$|\W\w|\w\W)
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 PHP, please visit: http://php.net/manual/en/ref.pcre.php