Update on "Add regex stuff"

[ghstack-poisoned]

src/models/capture_group_patterns.rs

@@ -41,18 +41,16 @@ impl CGPattern {
   }
 
   pub(crate) fn extract_regex(&self) -> String {
-    let mut _val = self.pattern();
-    _val.replace_range(..4, "rgx ");
+    let mut _val = &self.pattern()[4..];
     _val.to_string()
   }
 }
 
 impl Validator for CGPattern {
   fn validate(&self) -> Result<(), String> {
     if self.pattern().starts_with("rgx ") {
-      let mut _val = self.pattern();
-      _val.replace_range(..4, "rgx ");
-      return Regex::new(_val.as_str())
+      let mut _val = &self.pattern()[4..];
+      return Regex::new(_val)
         .map(|_| Ok(()))
         .unwrap_or(Err(format!("Cannot parse the regex - {_val}")));
     }

src/tests/test_piranha_java.rs

@@ -66,6 +66,7 @@ create_rewrite_tests! {
   test_new_line_character_used_in_string_literal:  "new_line_character_used_in_string_literal",   1;
   test_java_delete_method_invocation_argument: "delete_method_invocation_argument", 1;
   test_java_delete_method_invocation_argument_no_op: "delete_method_invocation_argument_no_op", 0;
+  test_regex_based_matcher: "regex_based_matcher", 1;
 }
 
 create_match_tests! {

test-resources/java/regex_based_matcher/configurations/rules.toml

@@ -0,0 +1,5 @@
+[[rules]]
+name = "replace_call"
+query = """rgx (?P<n>foo\\(\\))"""
+replace_node = "n"
+replace = "Foo"

test-resources/java/regex_based_matcher/expected/Sample.java

@@ -0,0 +1,10 @@
+package com.uber.piranha;
+
+class A {
+
+    void foobar() {
+        int total = Foo;
+        System.out.println(total);
+    }
+
+}

test-resources/java/regex_based_matcher/input/Sample.java

@@ -0,0 +1,10 @@
+package com.uber.piranha;
+
+class A {
+
+    void foobar() {
+        int total = foo();
+        System.out.println(total);
+    }
+
+}