Use grep without perl option

[chorry]

Used docker run --rm php php -r 'foreach (range(0,30000) as $i) {echo $i."\n"; sleep(1);}' as a test process

Build from default dockerfile as docker build -t phpspy-test .

➜  phpspy git:(master) docker run --pid=host --privileged --cap-add SYS_PTRACE --rm phpspy-test phpspy/phpspy --pid=2701841 
grep: unrecognized option: P
BusyBox v1.36.1 (2024-06-10 07:11:47 UTC) multi-call binary.

Usage: grep [-HhnlLoqvsrRiwFE] [-m N] [-A|B|C N] { PATTERN | -e PATTERN... | -f FILE... } [FILE]...
....
        -f FILE Read pattern from file
xargs: 'strings' terminated by signal 13
get_php_version: Could not detect PHP version

Patched version:

➜  phpspy git:(master) docker run --pid=host --privileged --cap-add SYS_PTRACE --rm phpspy-patched phpspy/phpspy --pid=2701841 -l 1
0 sleep <internal>:-1
1 <main> <internal>:-1

[adsr]

Hi, thanks for the PR. I don't think this will work with GNU grep (see test failures). Can you try changing both grep -os to grep -Eo and the \d metacharacters to [0-9]? I think BusyBox, BSD, and GNU grep all support -E (POSIX extended regex).