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Matching a Word 6 to 12 Letters Long Containting "Cat", "Dog" or "Mouse"
\b
(?=
\w
{6,12}
\b
)
\w
{0,9}
(
cat
|
dog
|
mouse
)
\w
*
Options: case insensitive
Assert position at a word boundary
Assert that the regex below can be matched, starting at this position (positive lookahead)
Match a character that is a "word character" (letters, digits, etc.)
Between 6 and 12 times, as many times as possible, giving back as needed (greedy)
Assert position at a word boundary
Match a character that is a "word character" (letters, digits, etc.)
Between zero and 9 times, as many times as possible, giving back as needed (greedy)
Match the regular expression below and capture its match into backreference number 1
Match either the regular expression below (attempting the next alternative only if this one fails)
Match the characters "cat" literally
Or match regular expression number 2 below (attempting the next alternative only if this one fails)
Match the characters "dog" literally
Or match regular expression number 3 below (the entire group fails if this one fails to match)
Match the characters "mouse" literally
Match a character that is a "word character" (letters, digits, etc.)
Between zero and unlimited times, as many times as possible, giving back as needed (greedy)
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