From 4b5210585a8d0bb085b959d3d0ef27cbee48ec3a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mike=20Schw=C3=B6rer?= <mailport@mikescher.de>
Date: Sat, 17 Dec 2016 01:53:06 +0100
Subject: [PATCH] Added operation 'filter'

---
 src/js/config/Categories.js      |  1 +
 src/js/config/OperationConfig.js | 23 +++++++++++++++++++++++
 src/js/operations/StrUtils.js    | 26 ++++++++++++++++++++++++++
 3 files changed, 50 insertions(+)

diff --git a/src/js/config/Categories.js b/src/js/config/Categories.js
index f75a5484..304b006c 100755
--- a/src/js/config/Categories.js
+++ b/src/js/config/Categories.js
@@ -148,6 +148,7 @@ const Categories = [
             "Sort",
             "Unique",
             "Split",
+            "Filter",
             "Count occurrences",
             "Expand alphabet range",
             "Parse escaped string",
diff --git a/src/js/config/OperationConfig.js b/src/js/config/OperationConfig.js
index 5591a43c..52f7a6a9 100755
--- a/src/js/config/OperationConfig.js
+++ b/src/js/config/OperationConfig.js
@@ -1764,6 +1764,29 @@ const OperationConfig = {
             }
         ]
     },
+    "Filter": {
+        description: "Filter the string with an regular expression",
+        run: StrUtils.run_filter,
+        input_type: "string",
+        output_type: "string",
+        args: [
+            {
+                name: "Delimiter",
+                type: "option",
+                value: StrUtils.DELIMITER_OPTIONS
+            },
+            {
+                name: "Regex",
+                type: "string",
+                value: ""
+            },
+            {
+                name: "Invert condition",
+                type: "boolean",
+                value: SeqUtils.SORT_REVERSE
+            },
+        ]
+    },
     "Strings": {
         description: "Extracts all strings from the input.",
         run: Extract.run_strings,
diff --git a/src/js/operations/StrUtils.js b/src/js/operations/StrUtils.js
index e0d10105..71d3436a 100755
--- a/src/js/operations/StrUtils.js
+++ b/src/js/operations/StrUtils.js
@@ -261,6 +261,32 @@ var StrUtils = {
             
         return sections.join(join_delim);
     },
+
+    /**
+     * Filter by regex operation.
+     *
+     * @author Mikescher (https://github.com/Mikescher | https://mikescher.com)
+     *
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run_filter: function(input, args) {
+        var delim = Utils.char_rep[args[0]];
+        var reverse = args[2];
+
+        try {
+            var regex = new RegExp(args[1]);
+        } catch (err) {
+            return "Invalid regex. Details: " + err.message;
+        }
+
+        const regex_filter = function(value) {
+            return reverse ^ regex.test(value);
+        }
+
+        return input.split(delim).filter(regex_filter).join(delim);
+    },
     
     
     /**