First commit

.gitignore

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+/target
+/regexer.iml
+/.idea/

Cargo.toml

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+[package]
+name = "regexer"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+eframe = "0.22.0"
+env_logger = "0.10.0"
+regex = "1.8.3"

src/main.rs

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+#![windows_subsystem = "windows"]
+
+use eframe::egui;
+use regex::Regex;
+
+fn replace_with_regex(pattern: &str, replacement: &str, input: &str) -> String {
+    let regex = Regex::new(pattern).unwrap();
+    if let Some(captures) = regex.captures(input) {
+        let replaced = replacement
+            .split_whitespace()
+            .map(|part| {
+                if part.starts_with('{') && part.ends_with('}') {
+                    let index_str = &part[1..part.len() - 1];
+                    let index: usize = index_str.parse().unwrap();
+                    captures.get(index).map_or(part, |m| m.as_str())
+                } else {
+                    part
+                }
+            })
+            .collect::<Vec<&str>>()
+            .join(" ");
+        return replaced;
+    }
+    String::new()
+}
+
+fn main() -> Result<(), eframe::Error> {
+    env_logger::init();
+    let options = eframe::NativeOptions {
+        initial_window_size: Some(egui::vec2(300.0, 245.0)),
+        resizable: false,
+        ..Default::default()
+    };
+    eframe::run_native("Regexer", options, Box::new(|_cc| Box::<MyApp>::default()))
+}
+
+struct MyApp {
+    pattern: String,
+    replacement: String,
+    input: String,
+    output: String,
+}
+
+impl Default for MyApp {
+    fn default() -> Self {
+        Self {
+            pattern: r"(\d+)".to_owned(),
+            replacement: "{1}".to_owned(),
+            input: "viva o benfica 123 - viva 323".to_owned(),
+            output: String::new(),
+        }
+    }
+}
+
+impl eframe::App for MyApp {
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        egui::CentralPanel::default().show(ctx, |ui| {
+            //ui.heading("My egui Application");
+            ui.horizontal(|ui| {
+                let pattern_label = ui.label("Pattern: ");
+                ui.text_edit_singleline(&mut self.pattern)
+                    .labelled_by(pattern_label.id);
+            });
+            ui.horizontal(|ui| {
+                let replacement_label = ui.label("Replacement: ");
+                ui.text_edit_singleline(&mut self.replacement)
+                    .labelled_by(replacement_label.id);
+            });
+
+            ui.vertical(|ui| {
+                let input_label = ui.label("Input");
+                ui.text_edit_multiline(&mut self.input)
+                    .labelled_by(input_label.id);
+
+                let output_label = ui.label("Output");
+                ui.text_edit_multiline(&mut self.output)
+                    .labelled_by(output_label.id);
+            });
+
+            if ui.button("Do it").clicked() {
+                self.output = replace_with_regex(&self.pattern, &self.replacement, &self.input);
+            }
+        });
+    }
+}