diff --git a/pkg/oniguruma/build.zig b/pkg/oniguruma/build.zig
index 920a17460..70a1e9312 100644
--- a/pkg/oniguruma/build.zig
+++ b/pkg/oniguruma/build.zig
@@ -24,7 +24,7 @@ pub fn build(b: *std.Build) !void {
         test_step.dependOn(&tests_run.step);
 
         // Uncomment this if we're debugging tests
-        // b.installArtifact(test_exe);
+        b.installArtifact(test_exe);
     }
 }
 
diff --git a/pkg/oniguruma/errors.zig b/pkg/oniguruma/errors.zig
index f5ec71279..b9edf2d36 100644
--- a/pkg/oniguruma/errors.zig
+++ b/pkg/oniguruma/errors.zig
@@ -5,9 +5,9 @@ const Encoding = @import("types.zig").Encoding;
 pub const MAX_ERROR_LEN = c.ONIG_MAX_ERROR_MESSAGE_LEN;
 
 /// Convert an Oniguruma error to an error.
-pub fn convertError(code: c_int) !void {
+pub fn convertError(code: c_int) !c_int {
+    if (code >= 0) return code;
     switch (code) {
-        c.ONIG_NORMAL => {},
         else => return error.OnigurumaError,
     }
 }
diff --git a/pkg/oniguruma/init.zig b/pkg/oniguruma/init.zig
index 531f9e0c7..3e40887c0 100644
--- a/pkg/oniguruma/init.zig
+++ b/pkg/oniguruma/init.zig
@@ -5,7 +5,7 @@ const errors = @import("errors.zig");
 /// Call once per process to initialize Oniguruma. This should be given
 /// the encodings that the program will use.
 pub fn init(encs: []const *Encoding) !void {
-    try errors.convertError(c.onig_initialize(
+    _ = try errors.convertError(c.onig_initialize(
         @constCast(@ptrCast(@alignCast(encs.ptr))),
         @intCast(encs.len),
     ));
diff --git a/pkg/oniguruma/main.zig b/pkg/oniguruma/main.zig
index 113f23e5c..5e56c70be 100644
--- a/pkg/oniguruma/main.zig
+++ b/pkg/oniguruma/main.zig
@@ -1,6 +1,7 @@
 pub usingnamespace @import("init.zig");
 pub usingnamespace @import("errors.zig");
 pub usingnamespace @import("regex.zig");
+pub usingnamespace @import("region.zig");
 pub usingnamespace @import("types.zig");
 pub const c = @import("c.zig");
 
diff --git a/pkg/oniguruma/regex.zig b/pkg/oniguruma/regex.zig
index 490129220..3e4e563d5 100644
--- a/pkg/oniguruma/regex.zig
+++ b/pkg/oniguruma/regex.zig
@@ -3,6 +3,7 @@ const c = @import("c.zig");
 const types = @import("types.zig");
 const errors = @import("errors.zig");
 const testEnsureInit = @import("testing.zig").ensureInit;
+const Region = @import("region.zig").Region;
 const ErrorInfo = errors.ErrorInfo;
 const Encoding = types.Encoding;
 const Option = types.Option;
@@ -19,7 +20,7 @@ pub const Regex = struct {
         err: ?*ErrorInfo,
     ) !Regex {
         var self: Regex = undefined;
-        try errors.convertError(c.onig_new(
+        _ = try errors.convertError(c.onig_new(
             &self.value,
             pattern.ptr,
             pattern.ptr + pattern.len,
@@ -34,10 +35,49 @@ pub const Regex = struct {
     pub fn deinit(self: *Regex) void {
         c.onig_free(self.value);
     }
+
+    /// onig_search shorthand to search an entire string.
+    pub fn search(
+        self: *Regex,
+        str: []const u8,
+        region: *Region,
+        options: Option,
+    ) !usize {
+        return try self.searchAdvanced(str, 0, str.len, region, options);
+    }
+
+    /// onig_search
+    pub fn searchAdvanced(
+        self: *Regex,
+        str: []const u8,
+        start: usize,
+        end: usize,
+        region: *Region,
+        options: Option,
+    ) !usize {
+        const pos = try errors.convertError(c.onig_search(
+            self.value,
+            str.ptr,
+            str.ptr + str.len,
+            str.ptr + start,
+            str.ptr + end,
+            @ptrCast(region),
+            options.int(),
+        ));
+
+        return @intCast(pos);
+    }
 };
 
 test {
+    const testing = std.testing;
+
     try testEnsureInit();
     var re = try Regex.init("foo", .{}, Encoding.utf8, Syntax.default, null);
     defer re.deinit();
+
+    var region: Region = .{};
+    defer region.deinit();
+    const pos = try re.search("hello foo bar", &region, .{});
+    try testing.expectEqual(@as(usize, 6), pos);
 }
diff --git a/pkg/oniguruma/region.zig b/pkg/oniguruma/region.zig
new file mode 100644
index 000000000..b8c61fc4f
--- /dev/null
+++ b/pkg/oniguruma/region.zig
@@ -0,0 +1,16 @@
+const std = @import("std");
+const c = @import("c.zig");
+
+pub const Region = extern struct {
+    allocated: c_int = 0,
+    num_regs: c_int = 0,
+    beg: ?[*]c_int = null,
+    end: ?[*]c_int = null,
+    history_root: ?*c.OnigCaptureTreeNode = null, // TODO: convert to Zig
+
+    pub fn deinit(self: *Region) void {
+        // We never free ourself because allocation of Region in the Zig
+        // bindings is handled by the Zig program.
+        c.onig_region_free(@ptrCast(self), 0);
+    }
+};