193: Valid Phone Numbers; solution.

Author: vetalapo

bash/src/193-valid-phone-numbers.sh

@@ -0,0 +1,33 @@
+##
+# 193
+# Valid Phone Numbers
+##
+# Given a text file file.txt
+# that contains a list of phone numbers (one per line),
+# write a one-liner bash script to print all valid phone numbers.
+#
+# You may assume
+# that a valid phone number must appear
+# in one of the following two formats:
+#   (xxx) xxx-xxxx or xxx-xxx-xxxx. (x means a digit)
+#
+# You may also assume each line in the text file
+# must not contain leading or trailing white spaces.
+#
+# Example:
+#   Assume that file.txt has the following content:
+#     987-123-4567
+#     123 456 7890
+#     (123) 456-7890
+#
+#   Your script should output the following valid phone numbers:
+#     987-123-4567
+#     (123) 456-7890
+##
+# https://leetcode.com/problems/valid-phone-numbers/
+##
+
+#!/bin/bash
+
+# Read from the file file.txt and output all valid phone numbers to stdout.
+grep "\(^[0-9]\{3\}-[0-9]\{3\}-[0-9]\{4\}$\)\|\(^([0-9]\{3\}) [0-9]\{3\}-[0-9]\{4\}$\)" file.txt