Regexp exact word match

问题

I need to match words from lines. For example:

The blue bird is dancing.
Yellow card is drawn
The day is perfect rainy
blue bird is eating

The four lines are in a text file l2.

I want to match the blue bird, yellow card, day and every time a line is printed that matched word is printed before the line.

y=regexp(l2,('^(?=.*blue bird)|(?=.*day)|(?=.*Yellow card)$'));

Is this how it works? I can't get the result.

sprintf('[%s]',y,l2);

回答1:

MATLAB's regex engine doesn't use \b as word boundary anchors but \< and \>.

So your regex would become

y = regexp(l2, '^(?=.*\<(?:blue bird|day|Yellow card)\>).*', 'lineanchors');

assuming that l2 is a multiline string.

回答2:

Try this reg exp.

(?:blue bird|yellow card|day)

来源：https://stackoverflow.com/questions/25306738/regexp-exact-word-match