Regex search within files

Skills and elements used

File manipulation, input validation, regular expressions

Program specification

Write a program that takes the name of a text file and a regular expression from the command line and

displays any lines from the text file that match the regular expression along with the line number. After

your program is finished be sure and close your open file.

Note: You will probably need to put quotes around your regular expression if it contains special

characters such as backslashes.

Verify that the user has passed in the proper arguments and display an error if they have not.

If the file does not exist or cannot be opened display an error.

Example

$ python

search.py

Error: You must supply a filename and regex

Ex$.$ python

search.py file.txt $""$btest$\backslash$b$"$

$ python

search.py file.txt $"\backslash$btest$\backslash$b$"$

$03$: The subject took the test and score an $87\%.$

$17$: since the test turned out to be meant for

Note: $3$ and $17$ are the line numbers where the text appears within

file.txt