skip regex operations on tag mismatch subject

src/line/code.rs

@@ -3,3 +3,5 @@ pub mod multiline;
 
 pub use inline::Inline;
 pub use multiline::Multiline;
+
+pub const TAG: &str = "```";

src/line/code/inline.rs

@@ -1,3 +1,4 @@
+use super::TAG;
 use glib::{Regex, RegexCompileFlags, RegexMatchFlags};
 
 /// Inline [preformatted](https://geminiprotocol.net/docs/gemtext-specification.gmi#in-pre-formatted-mode) entity holder
@@ -10,6 +11,12 @@ impl Inline {
 
     /// Parse `Self` from line string
     pub fn from(line: &str) -> Option<Self> {
+        // Skip next operations on prefix and postfix mismatch `TAG`
+        // * replace regex implementation @TODO
+        if !line.starts_with(TAG) && !line.ends_with(TAG) {
+            return None;
+        }
+
         // Parse line
         let regex = Regex::split_simple(
             r"^`{3}([^`]+)`{3}$",

src/line/code/multiline.rs

@@ -1,10 +1,11 @@
+use super::TAG;
+
 pub mod error;
 pub use error::Error;
 
 // Shared defaults
 
 pub const NEW_LINE: char = '\n';
-pub const TAG: &str = "```";
 
 /// Multi-line [preformatted](https://geminiprotocol.net/docs/gemtext-specification.gmi#in-pre-formatted-mode) entity holder
 pub struct Multiline {

src/line/link.rs

@@ -1,5 +1,7 @@
 use glib::{DateTime, Regex, RegexCompileFlags, RegexMatchFlags, TimeZone, Uri, UriFlags};
 
+pub const TAG: &str = "=>";
+
 /// [Link](https://geminiprotocol.net/docs/gemtext-specification.gmi#link-lines) entity holder
 pub struct Link {
     pub alt: Option<String>,         // [optional] alternative link description
@@ -12,6 +14,11 @@ impl Link {
 
     /// Parse `Self` from line string
     pub fn from(line: &str, base: Option<&Uri>, timezone: Option<&TimeZone>) -> Option<Self> {
+        // Skip next operations on prefix mismatch
+        // * replace regex implementation @TODO
+        if !line.starts_with(TAG) {
+            return None;
+        }
         // Define initial values
         let mut alt = None;
         let mut timestamp = None;