I am trying to figure out how to get this regex to work the way I need it to properly. Basically I have a bunch of songs with there lyrics. I am looping through each song lyrics to see if they match the search phrase I am looking for and return the length of the string as like a match rating.
for example I have part of the lyrics of one song here:
"you gave up the love you got & that is that
she loves me now she loves you not and that where its at"
I am using this regexp to find a match:
(?mi)(\bShe\b).*(\bloves\b).*(\byou\b)
however it captures this group
"she loves me now she loves you"
I want to capture the smallest group possible which would just be "she loves you"
How can I make this capture the smallest group possible?
Some of my code below, I take in the phrase and split it into an array and then check to make sure the lyrics contains the word otherwise we can bail out. I then build a string that will become the regex
static int rankPhrase(String lyrics, String lyricsPhrase){
//This takes in song lyrics and the phrase we are searching for
//Split the phrase up into separate words
String[] phrase = lyricsPhrase.split("[^a-zA-Z]+");
//Start to build the regex
StringBuilder regex = new StringBuilder("(?im)"+"(\\" + "b" + phrase[0] + "\\b)");
//loop through each word in the phrase
for(int i = 1; i < phrase.length; i++){
//Check to see if this word exists in the lyrics first
if(lyrics.contains(phrase[i])){
//add this to the regex we will search for
regex.append(".*(\\b" + phrase[i] + "\\b)");
}else{
//if the song isn't found return the rank of
//-1 this means song doesn't contain phrase
return -1;
}
}
//Create the pattern
Pattern p = Pattern.compile(regex.toString());
Matcher m = p.matcher(lyrics);
//Check to see if it can find a match
if(m.find()){
//Store this match in a string
String match = m.group();
(\bShe\b)(?:(?!\b(?:she|loves|you)\b).)*(\bloves\b)(?:(?!\b(?:she|loves|you)\b).)*(\byou\b)
You can make use of lookahead
here.See demo.
https://regex101.com/r/hE4jH0/11
For java,use
(\\bShe\\b)(?:(?!\\b(?:she|loves|you)\\b).)*(\\bloves\\b)(?:(?!\\b(?:she|loves|you)\\b).)*(\\byou\\b)
Java's regex matcher only works in the forward direction. What you would need to do is iterate over the set of all matches found and choose the shortest one.
在这里你需要使用负向前瞻,
Pattern.compile("\\bShe\\b(?:(?!\\bshe\\b).)*?\\bloves\\b(?:(?!\\b(?:you|loves)\\b).)*\\byou\\b");
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