ESM: Port Extract.js module

src/core/lib/Extract.mjs

@@ -0,0 +1,41 @@
+/**
+ * Identifier extraction functions
+ *
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ *
+ */
+
+/**
+ * Runs search operations across the input data using regular expressions.
+ *
+ * @param {string} input
+ * @param {RegExp} searchRegex
+ * @param {RegExp} removeRegex - A regular expression defining results to remove from the
+ *      final list
+ * @param {boolean} includeTotal - Whether or not to include the total number of results
+ * @returns {string}
+ */
+export function search (input, searchRegex, removeRegex, includeTotal) {
+    let output = "",
+        total = 0,
+        match;
+
+    while ((match = searchRegex.exec(input))) {
+        // Moves pointer when an empty string is matched (prevents infinite loop)
+        if (match.index === searchRegex.lastIndex) {
+            searchRegex.lastIndex++;
+        }
+
+        if (removeRegex && removeRegex.test(match[0]))
+            continue;
+        total++;
+        output += match[0] + "\n";
+    }
+
+    if (includeTotal)
+        output = "Total found: " + total + "\n\n" + output;
+
+    return output;
+}