diff --git a/problems/193-valid-phone-numbers/file.txt b/problems/193-valid-phone-numbers/file.txt
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--- /dev/null
+++ b/problems/193-valid-phone-numbers/file.txt
@@ -0,0 +1,4 @@
+987-123-4567
+123 456 7890
+(123) 456-7890
+0(001) 345-0000
diff --git a/problems/193-valid-phone-numbers/main.sh b/problems/193-valid-phone-numbers/main.sh
new file mode 100755
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+++ b/problems/193-valid-phone-numbers/main.sh
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+#!/bin/bash
+grep -E "^([[:digit:]]{3}-|\([[:digit:]]{3}\) )[[:digit:]]{3}-[[:digit:]]{4}$" file.txt
diff --git a/problems/193-valid-phone-numbers/readme.md b/problems/193-valid-phone-numbers/readme.md
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+# 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
+```