Better way to detect if a string contains multiple words

java string substring contains
Silver picture Silver · Sep 19, 2013 · Viewed 68.3k times · Source

I am trying to create a program that detects if multiple words are in a string as fast as possible, and if so, executes a behavior. Preferably, I would like it to detect the order of these words too but only if this can be done fast. So far, this is what I have done:

if (input.contains("adsf") && input.contains("qwer")) {
    execute();          
}

As you can see, doing this for multiple words would become tiresome. Is this the only way or is there a better way of detecting multiple substrings? And is there any way of detecting order?

Answer

Christoph Walesch picture Christoph Walesch · Sep 19, 2013

I'd create a regular expression from the words:

Pattern pattern = Pattern.compile("(?=.*adsf)(?=.*qwer)");
if (pattern.matcher(input).find()) {
    execute();
}

For more details, see this answer: https://stackoverflow.com/a/470602/660143

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