Use sumatrapdf-tool.exe or SumatraPDF.exe with the same arguments.
To search text in file.pdf:
sumatrapdf-tool grep -i foo file.pdf
-i ignores case, i.e. performs a case-insensitive search, which is probably a good default.
Other options:
  • -a ignore accents (diacritics)

Search with a regular expression #

sumatrapdf-tool grep -i -G x.* file.pdf
  • -G specifies that the search pattern is a regular expression
  • -i combines it with the case-insensitive flag
  • x.* is a regular expression that matches every string that starts with x
For all options, see sumatrapdf-tool grep.