feat: Implement regex mode replacement

Cargo.toml

@@ -15,6 +15,7 @@ chrono = "0.4.35"
 clap = { version = "4.5.2", features = ["derive"] }
 env_logger = "0.11.3"
 log = "0.4.21"
+regex = "1.10.4"
 semver = { version = "1.0.22", features = ["serde"] }
 serde = { version = "1.0.197", features = ["derive"] }
 tera = { version = "1.19.1", features = ["builtins"] }

src/writer.rs

@@ -4,6 +4,7 @@ use std::io::prelude::*;
 use std::path::{Path, PathBuf};
 
 use anyhow::Result;
+use regex::Regex;
 use tera::{Context, Tera};
 
 use crate::config::FileConfig;
@@ -99,6 +100,11 @@ impl WriteTarget {
 
 impl WriteRule {
     fn update(&self, target: String) -> String {
+        // If regex is enabled, func runs using Regex directly.
+        if self.regex {
+            let search = Regex::new(&self.search).unwrap();
+            return search.replace(&target, &self.replace).to_string();
+        }
         let lines = self.search.split('\n').count();
         let mut buf: VecDeque<String> = VecDeque::new();
         let mut output: Vec<String> = Vec::new();

tests/return-0/multi-line-regex/after/.age.toml

@@ -0,0 +1,13 @@
+current_version = "0.2.0"
+
+[[files]]
+path = "example.txt"
+regex = true
+search = """
+version = '{{current_version}}'
+(.+)
+"""
+replace = """
+version = '{{new_version}}'
+world
+"""

tests/return-0/multi-line-regex/after/example.txt

@@ -0,0 +1,4 @@
+version = '0.2.0'
+world
+
+This line is kept.

tests/return-0/multi-line-regex/before/.age.toml

@@ -0,0 +1,13 @@
+current_version = "0.1.0"
+
+[[files]]
+path = "example.txt"
+regex = true
+search = """
+version = '{{current_version}}'
+(.+)
+"""
+replace = """
+version = '{{new_version}}'
+world
+"""

tests/return-0/multi-line-regex/before/example.txt

@@ -0,0 +1,4 @@
+version = '0.1.0'
+hello
+
+This line is kept.