drastically simplify fuzzer input

Author: 5225225

fuzz/fuzz_targets/fuzz_regex_match.rs

@@ -1,22 +1,10 @@
 #![no_main]
 use libfuzzer_sys::fuzz_target;
 
-fuzz_target!(|data: &[u8]| {
-    if data.len() < 2 {
-        return;
-    }
-    let split_point = data[0] as usize;
-    if let Ok(data) = std::str::from_utf8(&data[1..]) {
-        use std::cmp::max;
-        // split data into regular expression and actual input to search through
-        let len = data.chars().count();
-        let split_off_point = max(split_point, 1) % len as usize;
-        let char_index = data.char_indices().nth(split_off_point);
-        if let Some((char_index, _)) = char_index {
-            let (pattern, input) = data.split_at(char_index);
-            if let Ok(re) = regex::Regex::new(pattern) {
-                re.is_match(input);
-            }
-        }
+fuzz_target!(|data: (&str, &str)| {
+    let (pattern, input) = data;
+
+    if let Ok(re) = regex::Regex::new(pattern) {
+        re.is_match(input);
     }
 });