How To Use Regex In String List?

Question

I'm trying to use regex to find a pattern across a string list:

static List<Integer> getMatchingIndexes(List<String> list, String regex) {
    ListIterator<String> li = list.listIterator();
    List<Integer> indexes = new ArrayList<Integer>();
    System.out.println(list.matches("\\w.*"));
    while(li.hasNext()) {
        int i = li.nextIndex();
        String next = li.next();
        if(Pattern.matches(regex, next)) {
            indexes.add(i);
        }
    }
    System.out.println(indexes);
    return indexes; 
}

It looks like nothing is showing up int he list, when I try to see if there are any matches (list.matches("\w.*")); (just an example, not the actual regex), it keeps giving me an error:

The method matches(String) is undefined for the type List

How can I use regex on this list?

Anubian Noob · Accepted Answer · 2014-06-03 18:52:21Z

2

Iterate through the list (using a for-each loop) and check for matches:

for (String s : list) {
    s.matches("\\w.*");
    // Do stuff here.
}

answered Jun 3, 2014 at 18:52

Anubian Noob

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1 Comment

But I'm Not A Wrapper Class Over a year ago

@johnc. s is the currently selected String from list as it iterates.

David Yee · Accepted Answer · 2014-06-03 18:56:35Z

1

Try to iterate through each item in the List<Integer> by the following:

for(Integer i : indexes){
    System.out.println(i.toString().matches("\\w.*"));
}

The above is equivalent to:

for(int i=0; i<indexes.size(); i++){
    System.out.println(indexes.get(i).toString().matches("\\w.*"));
}

answered Jun 3, 2014 at 18:56

David Yee

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