Page.search ValueError: min() arg is an empty sequence

[bpugnaire]

Describe the bug

When using the page.search method with a regex, the program may raise a ValueError: min() arg is an empty sequence.

Code to reproduce the problem

The issue is not easily reproducible, on some pages with the same Regex pattern I get the expected behavior (list of match or an empty list if no match). And sometimes I get the error

Expected behavior

Get a list of match or an empty list if there are no matches

Actual behavior

Got the ValueError: min() arg is an empty sequence

Environment

• pdfplumber version: 0.7.1
• Python version: 3.8.1
• OS: Windows 10

Additional context

Traceback (most recent call last):

File "c:\Users\xxx.virtualenvs\project\lib\site-packages\pdfplumber\page.py", line 316, in search return text_layout.search(pattern, regex=regex, case=case) File "c:\Users\xxx.virtualenvs\project\lib\site-packages\pdfplumber\utils.py", line 528, in search return list(map(match_to_dict, gen)) File "c:\Users\xxx.virtualenvs\project\lib\site-packages\pdfplumber\utils.py", line 499, in match_to_dict x0, top, x1, bottom = objects_to_bbox(chars) File "c:\Users\xx.virtualenvs\project\lib\site-packages\pdfplumber\utils.py", line 207, in objects_to_bbox min(map(itemgetter("x0"), objects)), ValueError: min() arg is an empty sequence

[bpugnaire]

To be noted, I only encountered the bug when using Regex = True

[samkit-jain]

Hi @bpugnaire Appreciate your interest in the library and thanks for raising this issue. Could you please provide the sample code that you used to reproduce this issue? It would help us investigate and fix. If possible, the PDF that resulted in this behaviour as well.

[bpugnaire]

match_group = '(Figure|Fig.|fig.|Tab.|tab.|Tabl.)' search_result = page.search("(?<!((|[))"+match_group, regex=True)

The regex is here to capture "xxx Figure 1xxx" and not "xxx [Figure1 xxx"

[jsvine]

Thanks @bpugnaire. Are you able to share the PDF? That would make it easier to diagnose the situation.

[jsvine]

This is fixed in the above commit, and available as of v0.7.1.