I am trying to find the count of number of occurrences of a substring in a string using
function countOccurences(str,word){
var regex = new RegExp("\\b"+word+"\\b","gi");
console.log((str.match(regex)|| []).length);
}
let String=' test TEST TESTING Test I like testing <h3>TEST</h3> class="test id="test" ';
let asset="Test";
countOccurences(String,asset);
Here, the result I am getting is 6, which is ok as I want the exact match, but I want to exclude the test of class and id, so that the result I get is 4 and not 6.
You can form a regex that will match and capture the substrings you would like to skip when counting and match the asset in other contexts only.
The sample regex may look like
/\b((?:id|class)="Test\b)|\bTest\b/gi
This will match
\b((?:id|class)="Test\b) - word boundary, Group 1 capturing id or class, then ="Test as a whole word| - or\bTest\b - whole word TestSee the JavaScript demo:
function countOccurences(str,exceptions,word){
const pattern = "\\b((?:" + exceptions.map(x => x.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&')).join("|") + ')="' + word + "\\b)|\\b"+word+"\\b";
const regex = new RegExp(pattern,"gi");
let count = 0, m;
while (m = regex.exec(str)) {
if (!m[1]) {
count++;
}
}
console.log(count)
}
let text = ' test TEST TESTING Test I like testing <h3>TEST</h3> class="test id="test" ';
let asset="Test";
let exception_arr = ["id", "class"]
countOccurences(text,exception_arr,asset);
// => 4Another solution is based on the negative lookarounds (not support in all JavaScript environments yet):
function countOccurences(str,exceptions,word){
const pattern = "\\b(?<!\\b(?:" + exceptions.map(x => x.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&')).join("|") + ')=")'+word+"\\b";
const regex = new RegExp(pattern,"gi");
console.log((str.match(regex) || ['']).length);
}
let text = ' test TEST TESTING Test I like testing <h3>TEST</h3> class="test id="test" ';
let asset="Test";
let exception_arr = ["id", "class"]
countOccurences(text,exception_arr,asset);Here, /\b(?<!\b(?:id|class)=")Test\b/gi regex will match any Test as a whole word if it is not immediately preceded iwth id or class as whole words followed with =" substring.