1 files changed, 51 insertions, 0 deletions
diff --git a/Functions/stringFuncs.js b/Functions/stringFuncs.js
new file mode 100644
index 0000000..8dddc75
--- /dev/null
+++ b/Functions/stringFuncs.js
@@ -0,0 +1,51 @@
+function replaceElement(source, element, value) {
+    const firstTag = `<${element}>`;
+
+    const firstSpace = element.indexOf(" ");
+    if (firstSpace !== -1)
+        element = element.substring(0, firstSpace);
+    const startTag = `<${element}.*?>`;
+    const endTag = `</${element}.*?>`;
+
+    const span = getTagSpan(source, [startTag, endTag], firstTag);
+
+    return source.substring(0, span[0]) +
+        value +
+        source.substring(span[1]);
+}
+
+function getTagSpan(s, tags=["\\(", "\\)"], customFirstTag=undefined)
+{
+    customFirstTag = new RegExp(customFirstTag || tags[0]);
+    let i = s.search(customFirstTag);
+    if (i === -1)
+        return s;
+    
+    tags = [
+        new RegExp("^" + tags[0]),
+        new RegExp("^" + tags[1])
+    ];
+
+    const start = i;
+    i++;
+    let depth = 1;
+    while((depth !== 0) && (i !== s.length))
+    {
+        let maybeStartTag = s.substring(i);
+        let maybeEndTag = s.substring(i);
+        
+        depth += +tags[0].test(maybeStartTag) + -tags[1].test(maybeEndTag);
+
+        i++;
+    }
+     
+    i += (s.substring(i - 1).match(tags[1]) || [""])[0] .length - 1;
+    return [start, i];
+}
+
+const countOccurrences = (s, regex) => (s.match(regex) || []).length;
+module.exports = {
+    span: getTagSpan,
+    replaceElement: replaceElement,
+    count: countOccurrences
+}
+\ No newline at end of file