Anchor IsJSON regex to prevent false positives on CDATA

sibprogrammer · bukzor · sibprogrammer · commit 039d89a66644 · 2026-06-03T20:09:41.000+01:00
Co-Authored-By: Buck Evan &lt;workitharder@gmail.com&gt;
diff --git a/internal/utils/utils.go b/internal/utils/utils.go
@@ -531,7 +531,7 @@ func IsHTML(input string) bool {
 
 func IsJSON(input string) bool {
 	input = strings.ToLower(input)
-	matched, _ := regexp.MatchString(`\s*[{\[]`, input)
+	matched, _ := regexp.MatchString(`^\s*[{\[]`, input)
 	return matched
 }
 
diff --git a/internal/utils/utils_test.go b/internal/utils/utils_test.go
@@ -184,6 +184,7 @@ func TestIsJSON(t *testing.T) {
 	assert.True(t, IsJSON(`[1, 2, 3]`))
 	assert.True(t, IsJSON(`   {}`))
 	assert.False(t, IsJSON(`<html></html>`))
+	assert.False(t, IsJSON(`<![CDATA[text]]>`))
 }
 
 func TestPagerPrint(t *testing.T) {

Original file line number	Diff line number	Diff line change
`@@ -531,7 +531,7 @@ func IsHTML(input string) bool {`
`531`	`531`
`532`	`532`	`func IsJSON(input string) bool {`
`533`	`533`	`input = strings.ToLower(input)`
`534`		- matched, _ := regexp.MatchString(`\s*[{\[]`, input)
	`534`	+ matched, _ := regexp.MatchString(`^\s*[{\[]`, input)
`535`	`535`	`return matched`
`536`	`536`	`}`
`537`	`537`
Original file line number	Diff line number	Diff line change
`@@ -184,6 +184,7 @@ func TestIsJSON(t *testing.T) {`
`184`	`184`	assert.True(t, IsJSON(`[1, 2, 3]`))
`185`	`185`	assert.True(t, IsJSON(` {}`))
`186`	`186`	assert.False(t, IsJSON(`<html></html>`))
	`187`	+ assert.False(t, IsJSON(`<![CDATA[text]]>`))
`187`	`188`	`}`
`188`	`189`
`189`	`190`	`func TestPagerPrint(t *testing.T) {`