feat: regex for pattern matching for signed and unsigned integers

examples/print.sr

@@ -1,4 +1,5 @@
 main() {
+     uint32 y = 1;
      uint8 x = 0;
      if x > 0 {
      	print("Hello World, x is zero");

src/main.rs

@@ -15,8 +15,18 @@ struct SymbolRow {
     scope: String,
     is_const: bool,
 }
+fn build_sym_table(stream: &Vec::<&str>) -> Vec<SymbolRow> {
+    let sym_table: Vec<SymbolRow> = vec![];
 
-static SYM_TABLE: Vec<SymbolRow> = Vec::new();
+    let rx_func = Regex::new(r"int[0-9]+|uint[0-9]+|string|char").unwrap();
+    for token in stream {
+	if rx_func.is_match(token){
+	    print!("{token} ");
+	}
+    }
+    return sym_table;
+    
+}
 
 fn main() -> std::io::Result<()>{
     PlumeBuilder::new()
@@ -37,9 +47,6 @@ fn main() -> std::io::Result<()>{
 
     let re = Regex::new(r"[ \n\t]+").unwrap();
     let tokens: Vec<&str> = re.split(&content).filter(|s| !s.is_empty()).collect();
-    for token in tokens {
-	print!("{token} ",);
-    }
-    
+    build_sym_table(&tokens);
     Ok(())
 }