Task 1 Week 346 in Raku by @ash

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+# Task 1 of The Weekly Challenge 346
+# https://theweeklychallenge.org/blog/perl-weekly-challenge-346/#TASK1
+
+say paren-len '(()())'; # 6
+say paren-len ')()())'; # 4
+say paren-len '((()))()(((()'; # 8
+say paren-len '))))((()('; # 2
+say paren-len '()(()'; # 2
+
+# An extra example to find the longest string out of the two options
+say paren-len '()((())'; # 4
+
+grammar parens {
+    rule sequence {
+        <balanced>+
+    }
+
+    rule balanced {
+        '(' <balanced>* ')'
+    }
+}
+
+sub paren-len($s) {
+    $s.match(/<parens::sequence>/, :g)>>.chars.max;
+}