regex: fix -F aho-corasick optimization

It turns out that when the -F flag was used, if any of the patterns
contained a regex meta character (such as `.`), then we winded up
escaping the pattern first before handing it off to Aho-Corasick, which
treats all patterns literally.

We continue to apply band-aides here and just avoid Aho-Corasick if
there is an escape in any of the literal patterns. This is unfortunate,
but making this work better requires more refactoring, and the right
solution is to get this optimization pushed down into the regex engine.

Fixes #1334

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/regression.rs b/tests/regression.rs
index 40a84654..88f2194d 100644
--- a/tests/regression.rs
+++ b/tests/regression.rs
@@ -716,3 +716,13 @@ rgtest!(r1259_drop_last_byte_nonl, |dir: Dir, mut cmd: TestCommand| {
     cmd = dir.command();
     eqnice!("fz\n", cmd.arg("-f").arg("patterns-nl").arg("test").stdout());
 });
+
+// See: https://github.com/BurntSushi/ripgrep/issues/1334
+rgtest!(r1334_crazy_literals, |dir: Dir, mut cmd: TestCommand| {
+    dir.create("patterns", &"1.208.0.0/12\n".repeat(40));
+    dir.create("corpus", "1.208.0.0/12\n");
+    eqnice!(
+        "1.208.0.0/12\n",
+        cmd.arg("-Ff").arg("patterns").arg("corpus").stdout()
+    );
+});