fix(pkg):do regex precompile insteadd on the fly (#911)

* fix(pkg/providers):do regex precompile insteadd on the fly

* fix(providers): replace HTTP-specific regex with standalone status code matcher

The precompiled HTTP regex used uppercase "HTTP" which never matched
because ClassifyError lowercases the input. Replace it with a
case-insensitive word-boundary pattern that matches any standalone
3-digit status code (300-599), which also subsumes the HTTP/x.x case.

Add test case for standalone status code extraction.

* fix(providers): restore http regex and add standalone status code matcher

Restore the http-prefixed regex (without unnecessary (?i) flag since
input is already lowercased by ClassifyError) as a mid-priority pattern
to reduce false positives. Add a standalone word-boundary matcher as a
fallback for bare status codes like "429". Fix test to use lowercased
input matching the actual calling convention.

* perf(tools): move path regex compilation from per-call to package init

The path regex in guardCommand was compiled on every call. Hoist it
to a package-level var (absolutePathPattern) alongside defaultDenyPatterns
in a single var block, so it is compiled once at init time.

* style(tools): move inline comment to fix golines formatting error

pkg/providers/error_classifier.go

@@ -6,6 +6,13 @@ import (
 	"strings"
 )
 
+// Common patterns in Go HTTP error messages
+var httpStatusPatterns = []*regexp.Regexp{
+	regexp.MustCompile(`status[:\s]+(\d{3})`),
+	regexp.MustCompile(`http[/\s]+\d*\.?\d*\s+(\d{3})`),
+	regexp.MustCompile(`\b([3-5]\d{2})\b`),
+}
+
 // errorPattern defines a single pattern (string or regex) for error classification.
 type errorPattern struct {
 	substring string
@@ -198,20 +205,13 @@ func classifyByMessage(msg string) FailoverReason {
 }
 
 // extractHTTPStatus extracts an HTTP status code from an error message.
-// Looks for patterns like "status: 429", "status 429", "HTTP 429", or standalone "429".
+// Looks for patterns like "status: 429", "status 429", "http/1.1 429", "http 429", or standalone "429".
 func extractHTTPStatus(msg string) int {
-	// Common patterns in Go HTTP error messages
-	patterns := []*regexp.Regexp{
-		regexp.MustCompile(`status[:\s]+(\d{3})`),
-		regexp.MustCompile(`HTTP[/\s]+\d*\.?\d*\s+(\d{3})`),
-	}
-
-	for _, p := range patterns {
+	for _, p := range httpStatusPatterns {
 		if m := p.FindStringSubmatch(msg); len(m) > 1 {
 			return parseDigits(m[1])
 		}
 	}
-
 	return 0
 }
 

pkg/providers/error_classifier_test.go

@@ -305,7 +305,8 @@ func TestExtractHTTPStatus(t *testing.T) {
 	}{
 		{"status: 429 rate limited", 429},
 		{"status 401 unauthorized", 401},
-		{"HTTP/1.1 502 Bad Gateway", 502},
+		{"http/1.1 502 bad gateway", 502},
+		{"error 429", 429},
 		{"no status code here", 0},
 		{"random number 12345", 0},
 	}

pkg/tools/shell.go

@@ -24,11 +24,15 @@ type ExecTool struct {
 	restrictToWorkspace bool
 }
 
-var defaultDenyPatterns = []*regexp.Regexp{
+var (
+	defaultDenyPatterns = []*regexp.Regexp{
 		regexp.MustCompile(`\brm\s+-[rf]{1,2}\b`),
 		regexp.MustCompile(`\bdel\s+/[fq]\b`),
 		regexp.MustCompile(`\brmdir\s+/s\b`),
-	regexp.MustCompile(`\b(format|mkfs|diskpart)\b\s`), // Match disk wiping commands (must be followed by space/args)
+		// Match disk wiping commands (must be followed by space/args)
+		regexp.MustCompile(
+			`\b(format|mkfs|diskpart)\b\s`,
+		),
 		regexp.MustCompile(`\bdd\s+if=`),
 		regexp.MustCompile(`>\s*/dev/sd[a-z]\b`), // Block writes to disk devices (but allow /dev/null)
 		regexp.MustCompile(`\b(shutdown|reboot|poweroff)\b`),
@@ -67,7 +71,11 @@ var defaultDenyPatterns = []*regexp.Regexp{
 		regexp.MustCompile(`\bssh\b.*@`),
 		regexp.MustCompile(`\beval\b`),
 		regexp.MustCompile(`\bsource\s+.*\.sh\b`),
-}
+	}
+
+	// absolutePathPattern matches absolute file paths in commands (Unix and Windows).
+	absolutePathPattern = regexp.MustCompile(`[A-Za-z]:\\[^\\\"']+|/[^\s\"']+`)
+)
 
 func NewExecTool(workingDir string, restrict bool) (*ExecTool, error) {
 	return NewExecToolWithConfig(workingDir, restrict, nil)
@@ -287,8 +295,7 @@ func (t *ExecTool) guardCommand(command, cwd string) string {
 			return ""
 		}
 
-		pathPattern := regexp.MustCompile(`[A-Za-z]:\\[^\\\"']+|/[^\s\"']+`)
-		matches := pathPattern.FindAllString(cmd, -1)
+		matches := absolutePathPattern.FindAllString(cmd, -1)
 
 		for _, raw := range matches {
 			p, err := filepath.Abs(raw)