pgrep: The pattern is too long (more than 15 characters) and should be able to match pid correctly.

[Franklin-Qi]

The PIDs should be obtained in advance. If the PIDs exist, it means the pattern matches, and there should be no length error.

Closes: #121

[dezgeg]

Would be better to add the check to find_matching_pids (I think), calling collect_matched_pids() will essentially halve performance of the program

[Franklin-Qi]

Would be better to add the check to find_matching_pids (I think), calling collect_matched_pids() will essentially halve performance of the program

@dezgeg Thanks for the feedback. Calling the collect_matched_pids function twice does indeed impact performance. Moving the length error information to the subsequent find_matching_pids might be a better idea.