Add regex switch expression tool

tools/regex_switch/.shed.yml

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+categories:
+- Text Manipulation
+description: Regex switch
+long_description: |
+  Regex switch outputs a boolean from regex on element identifier.
+name: regex_switch
+owner: iuc
+remote_repository_url: https://github.com/galaxyproject/tools-iuc/tree/master/tools/regex_switch
+homepage_url: https://github.com/galaxyproject/tools-iuc/tree/master/tools/regex_switch
+type: unrestricted

tools/regex_switch/regex_switch.xml

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+<tool name="Regex switch" id="regex_switch" version="@TOOL_VERSION@+galaxy@VERSION_SUFFIX@" tool_type="expression">
+    <description>boolean from regex on element identifier</description>
+    <macros>
+        <token name="@TOOL_VERSION@">1.0.0</token>
+        <token name="@VERSION_SUFFIX@">0</token>
+    </macros>
+    <expression type="ecma5.1"><![CDATA[{
+        var name = $job.input.name;
+        var pat = $job.pattern;
+        var matched = false;
+
+        try {
+            if (pat !== "") {
+                var re = new RegExp(pat);
+                matched = re.test(name);
+            }
+        } catch (e) {
+            return { "__error_message": "Invalid regular expression: " + (e && e.message ? e.message : String(e)) };
+        }
+
+        return { "matched": matched, "unmatched": !matched };
+    }]]></expression>
+    <inputs>
+        <param name="input" type="data" format="data"
+               label="Dataset" />
+        <param name="pattern" sanitize="false" type="text" label="Regex pattern"
+               help="Example: \.csv$">
+              <sanitizer>
+                  <valid>
+                      <add preset="string.printable"/>
+                  </valid>
+              </sanitizer>
+        </param>
+    </inputs>
+    <outputs>
+        <output type="boolean" name="matched" from="matched" label="Match result"/>
+        <output type="boolean" name="unmatched" from="unmatched" label="Unmatched result"/>
+    </outputs>
+    <tests>
+        <test expect_num_outputs="2">
+            <param name="input" value="sample.csv" ftype="txt"/>
+            <param name="pattern" value="\.csv$"/>
+            <output name="matched"   value_json="true"/>
+            <output name="unmatched" value_json="false"/>
+        </test>
+
+        <test expect_num_outputs="2">
+            <param name="input" value="table.tsv" ftype="txt"/>
+            <param name="pattern" value="\.csv$"/>
+            <output name="matched"   value_json="false"/>
+            <output name="unmatched" value_json="true"/>
+        </test>
+    </tests>
+    <help><![CDATA[
+**Regex switch**
+
+Matches a regular expression against the name of the input file. It emits two booleans:
+`matched` (the match result) and `unmatched` (its negation). Connect either to a step's **Conditionally skip step?** input.
+]]></help>
+</tool>

tools/regex_switch/test-data/sample.csv

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+col1,col2
+1,2

tools/regex_switch/test-data/table.tsv

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+col1	col2
+1	2