Regex

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Lab

This is the original contents of the lab file (../labs/04-regex/04-regex.lab.sh).

Follow the instructions in the file to solve the lab.

# Assume "LAB04_STRING" is passed as the "$1" positional parameter
# Set a string below that match the regex in "LAB04_REGEX"
LAB04_STRING="YourStringHere"
export LAB04_STRING

# Assume "LAB04_REGEX" is passed as the "$2" positional parameter
LAB04_REGEX="^[0-4a-h]+"
export LAB04_REGEX

sobash_assert_string_matches_regex() {

  local -n string
  local -n regex

  string="$1"
  regex="$2"

  if [[ "${string}" =~ ${regex} ]]; then
    echo -e "\n[INFO] ${FUNCNAME[0]} | String (${string}) had a regex match (${BASH_REMATCH[0]})."
    return 0
  else
    echo -e "\n[FAIL] ${FUNCNAME[0]} | String (${string}) did NOT have a regex match (${BASH_REMATCH[0]})." 1>&2
    return 2
  fi

}

Test

This is the original contents of the test file (../labs/04-regex/04-regex.test.sh).

Review the test cases and your lab file.

Will the lab file (../labs/04-regex/04-regex.lab.sh) pass all test cases?

#!/usr/bin/env bash

test_assert_string_matches_regex() {

   ../build/sobash assert-string-matches-regex LAB04_STRING LAB04_REGEX
   assertEquals 0 $?

}
source ./shunit2

When ready, run the following to execute the tests above against the lab file:

cd "${HOME}/bash-programming/src/" \ 
  && ./test.sh lab 04-regex

Solution

This is the original contents of the solution file (../labs/04-regex/04-regex.solution.sh).

This file contains an example of a viable solution that passes all the test cases.

# Assume "LAB04_STRING" is passed as the "$1" positional parameter
# Set a string below that match the regex in "LAB04_REGEX"
LAB04_STRING="4a259"
export LAB04_STRING

# Assume "LAB04_REGEX" is passed as the "$2" positional parameter
LAB04_REGEX="^[0-4a-h]+"
export LAB04_REGEX

sobash_assert_string_matches_regex() {

  local -n string
  local -n regex

  string="$1"
  regex="$2"

  if [[ "${string}" =~ ${regex} ]]; then
    echo -e "\n[INFO] ${FUNCNAME[0]} | String (${string}) had a regex match (${BASH_REMATCH[0]})."
    return 0
  else
    echo -e "\n[FAIL] ${FUNCNAME[0]} | String (${string}) did NOT have a regex match (${BASH_REMATCH[0]})." 1>&2
    return 2
  fi

}

Run the following to execute the tests above against the solution file:

cd "${HOME}/bash-programming/src/" \ 
  && ./test.sh solution 04-regex

Feel free to run the following to override the contents of the lab file with the solution file.

cd "${HOME}/bash-programming/labs/" \ 
  && cp ./04-regex/04-regex.{solution,lab}.sh