Clever Geek Handbook

Regular expression to match a single variable word sentence

How to match a word list using regular expression.

How I want to match

This is a apple
This is a orange
This is a peach

I tried it This is a [apple|range|peach]

.

Does not work.

Any ideas? I sent 5 hours to this, the "rules" are published, but without exhaustive examples, these rules are too mystical.

+2


source to share


4 answers


you can use



    Pattern pattern = Pattern.compile( "This is a (apple|orange|peach)" );

    Matcher matcher = pattern.matcher( "This is a orange" );
    if( matcher.find() ) {
        System.out.println( matcher.group( 1 ) );
    }
+5


source 


This is a ((?:(?:apple|orange|peach)/?)+)

will match

This is a apple/orange/peach.

regardless of order.

You will only get one capture group representing the entire list.
(here "apple / orange / peach").



  • ' (?:apple|orange|peach)

    ' means: matching one of these three terms, do not write it down
  • ' (?:.../?)+

    ': match string terminated with '/' or multiple times
  • ' (...)

    ': grab the entire list.

This is an apple <-match. It's orange <-match. This is a peach <-match. This is a banana match.

This is a (apple|orange|peach)

enough: the [apple|orange|peach]

one you've tried is actually a character class and will match any 'a', 'p' '|', 'o', ... etc.

+1


source


I'm not sure about Java regex, but it would be something like

/ (apple | orange | peach) /

those. group them and use | say "or".

0


source


Try the following:

String str = "This is a peach";
boolean matches = str.matches("(apple|orange|peach)");

If you are using a template you can use

String str = "This is a peach";
Pattern pat = Pattern.compile("(apple|orange|peach)");
Matcher matcher = pat.matcher(str);
boolean matches = matcher.find();
0


source






More articles:


All Articles