Refactor regex operations

src/metadata/message.rs

@@ -319,21 +319,7 @@ impl TryFromYaml for Message {
                             .expect("hardcoded Boost placeholder regex should be valid")
                     });
 
-                    let result = BOOST_REGEX.replace_all(&mc.text, |captures: &Captures| {
-                        match captures[1].parse::<u32>() {
-                            Ok(i) if i > 0 => format!("{{{}}}", i - 1),
-                            Ok(_) => {
-                                logging::warn!("Found zero-indexed placeholder using Boost syntax in string \"{}\"", mc.text);
-                                captures[0].to_string()
-                            },
-                            Err(e) => {
-                                logging::error!("Unexpected failure to parse Boost placeholder index \"{}\": {}", &captures[1], e);
-                                captures[0].to_string()
-                            }
-                        }
-                    });
-
-                    if let Cow::Owned(text) = result {
+                    if let Cow::Owned(text) = replace_all(&BOOST_REGEX, &mc.text) {
                         mc.text = text.into_boxed_str();
                     }
                 }
@@ -354,10 +340,10 @@ impl TryFromYaml for Message {
                     mc.text = mc.text.replace(&placeholder, sub).into_boxed_str();
                 }
 
-                if let Ok(Some(m)) = FMT_REGEX.find(&mc.text) {
+                if let Some(m) = find_match(&FMT_REGEX, &mc.text) {
                     return Err(ParseMetadataError::new(
                         value.span.start,
-                        MetadataParsingErrorReason::MissingSubstitution(m.as_str().to_owned()),
+                        MetadataParsingErrorReason::MissingSubstitution(m.to_owned()),
                     ));
                 }
             }
@@ -373,6 +359,32 @@ impl TryFromYaml for Message {
     }
 }
 
+fn replace_all<'a>(regex: &Regex, text: &'a str) -> Cow<'a, str> {
+    regex.replace_all(text, |captures: &Captures| {
+        match captures[1].parse::<u32>() {
+            Ok(i) if i > 0 => format!("{{{}}}", i - 1),
+            Ok(_) => {
+                logging::warn!(
+                    "Found zero-indexed placeholder using Boost syntax in string \"{text}\""
+                );
+                captures[0].to_string()
+            }
+            Err(e) => {
+                logging::error!(
+                    "Unexpected failure to parse Boost placeholder index \"{}\": {}",
+                    &captures[1],
+                    e
+                );
+                captures[0].to_string()
+            }
+        }
+    })
+}
+
+fn find_match<'a>(regex: &Regex, text: &'a str) -> Option<&'a str> {
+    regex.find(text).ok().flatten().map(|m| m.as_str())
+}
+
 impl EmitYaml for MessageContent {
     fn emit_yaml(&self, emitter: &mut YamlEmitter) {
         emitter.begin_map();

src/metadata/plugin_metadata.rs

@@ -274,9 +274,7 @@ impl PluginName {
 
     fn matches(&self, other_name: &str) -> bool {
         if let Some(regex) = &self.regex {
-            regex.is_match(other_name).inspect_err(|e| {
-                logging::error!("Encountered an error while trying to match the regex {} to the string {}: {}", regex.as_str(), other_name, e);
-            }).unwrap_or(false)
+            is_regex_match(regex, other_name)
         } else {
             unicase::eq(self.string.as_ref(), other_name)
         }
@@ -382,6 +380,20 @@ fn replace_capturing_groups(regex_string: &str) -> Cow<'_, str> {
     }
 }
 
+fn is_regex_match(regex: &Regex, string: &str) -> bool {
+    regex
+        .is_match(string)
+        .inspect_err(|e| {
+            logging::error!(
+                "Encountered an error while trying to match the regex {} to the string {}: {}",
+                regex.as_str(),
+                string,
+                e
+            );
+        })
+        .unwrap_or(false)
+}
+
 impl TryFromYaml for PluginMetadata {
     fn try_from_yaml(value: &MarkedYaml) -> Result<Self, ParseMetadataError> {
         let mapping = as_mapping(value, YamlObjectType::PluginMetadata)?;

src/plugin/mod.rs

@@ -434,15 +434,7 @@ fn extract_version(description: &str) -> Result<Option<String>, Box<RegexImplErr
     });
 
     for regex in &*VERSION_REGEXES {
-        let version = regex
-            .captures(description)?
-            .iter()
-            .flat_map(|captures| captures.iter())
-            .flatten()
-            .skip(1) // Skip the first capture as that's the whole regex.
-            .map(|m| m.as_str().trim())
-            .find(|v| !v.is_empty())
-            .map(str::to_owned);
+        let version = find_captured_text(regex, description)?;
 
         if version.is_some() {
             return Ok(version);
@@ -452,6 +444,20 @@ fn extract_version(description: &str) -> Result<Option<String>, Box<RegexImplErr
     Ok(None)
 }
 
+fn find_captured_text(regex: &Regex, text: &str) -> Result<Option<String>, Box<RegexImplError>> {
+    let captured_text = regex
+        .captures(text)?
+        .iter()
+        .flat_map(|captures| captures.iter())
+        .flatten()
+        .skip(1) // Skip the first capture as that's the whole regex.
+        .map(|m| m.as_str().trim())
+        .find(|v| !v.is_empty())
+        .map(str::to_owned);
+
+    Ok(captured_text)
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;