initial commit

bash/matching-brackets/matching_brackets.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash -x
+shopt -s extglob
+str=$1
+# Brute force algorithm:
+# 1 - remove all unwanted chars: keep only {}[]()
+str=${str//[^\{\}\(\)\[\]]}
+
+res=true
+# 2- remove all pairs of [], {}, (). loop until string is empty (match ok) or unchanged
+# (nok)
+loop=1
+while [[ ${#str} > 0 ]]
+do
+    str2=${str//+(\[\]|\(\)|\{\})}
+    if [[ ${#str2} == ${#str} ]]; then
+        res=false
+        break
+    fi
+    str="$str2"
+done
+
+echo $res
+exit 0