fix pylibcudf declarations

python/pylibcudf/pylibcudf/libcudf/strings/findall.pxd

@@ -9,9 +9,9 @@ from pylibcudf.libcudf.strings.regex_program cimport regex_program
 cdef extern from "cudf/strings/findall.hpp" namespace "cudf::strings" nogil:
 
     cdef unique_ptr[column] findall(
-        column_view source_strings,
-        regex_program) except +
+        column_view input,
+        regex_program prog) except +
 
     cdef unique_ptr[column] find_re(
-        column_view source_strings,
-        regex_program) except +
+        column_view input,
+        regex_program prog) except +

python/pylibcudf/pylibcudf/strings/findall.pxd

@@ -4,4 +4,5 @@ from pylibcudf.column cimport Column
 from pylibcudf.strings.regex_program cimport RegexProgram
 
 
+cpdef Column find_re(Column input, RegexProgram pattern)
 cpdef Column findall(Column input, RegexProgram pattern)

python/pylibcudf/pylibcudf/strings/findall.pyx

@@ -38,3 +38,33 @@ cpdef Column findall(Column input, RegexProgram pattern):
         )
 
     return Column.from_libcudf(move(c_result))
+
+
+cpdef Column find_re(Column input, RegexProgram pattern):
+    """
+    Returns character positions where the pattern first matches
+    the elements in source_strings.
+
+    For details, see For details, see :cpp:func:`cudf::strings::find_re`.
+    Parameters
+    ----------
+    input : Column
+        Strings instance for this operation
+    pattern : RegexProgram
+        Regex pattern
+    Returns
+    -------
+    Column
+        New column of integers
+    """
+    cdef unique_ptr[column] c_result
+
+    with nogil:
+        c_result = move(
+            cpp_findall.find_re(
+                input.view(),
+                pattern.c_obj.get()[0]
+            )
+        )
+
+    return Column.from_libcudf(move(c_result))