build: use existing escapeRegExpString

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: na
  - task: lint_package_json
    status: na
  - task: lint_repl_help
    status: na
  - task: lint_javascript_src
    status: passed
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: na
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: na
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: na
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: Planeshifter

lib/node_modules/@stdlib/_tools/eslint/rules/tsdoc-doctest/lib/main.js

@@ -35,6 +35,7 @@ var contains = require( '@stdlib/assert/contains' );
 var replace = require( '@stdlib/string/replace' );
 var endsWith = require( '@stdlib/string/ends-with' );
 var trim = require( '@stdlib/string/trim' );
+var escapeRegExpString = require( '@stdlib/utils/escape-regexp-string' );
 var objectKeys = require( '@stdlib/utils/keys' );
 var compareValues = require( '@stdlib/_tools/doctest/compare-values' );
 var createAnnotationValue = require( '@stdlib/_tools/doctest/create-annotation-value' );
@@ -49,27 +50,15 @@ var debug = logger( 'tsdoc-doctest' );
 var RE_TSDOC = /\/\*\*[\s\S]+?\*\//g;
 var RE_EXAMPLE = /@example\s*([\s\S]*?)(?=\n\s*@\w|\*\/|$)/g;
 var RE_NEWLINE = /\r?\n/g;
-var RE_ANNOTATION = /(?:\n|^)(?:var|let|const)? ?([a-zA-Z0-9._]+) ?=[^;]*;\n\/\/ ?(returns|([A-Za-z][A-Za-z_0-9]*)? ?=>|throws) ?([\s\S]*?)(\n|$)/g;
+var RE_ANNOTATION = /(?:\n|^)(?:var|let|const)? ?([a-zA-Z0-9._]+) ?=[^;]*;\n\/\/ ?(returns|([A-Za-z][A-Za-z_0-9]*)? ?=>|throws) ?([\s\S]*?)(?=\n|$)/g;
 var RE_COMMENT_PREFIX = /^\s*\*\s?/gm;
-var RE_SPECIAL_CHARS = /[.*+?^${}()|[\]\\]/g;
 var regexCache = {};
 var lineCountCache = {};
 var rule;
 
 
 // FUNCTIONS //
 
-/**
-* Escapes special regex characters in a string.
-*
-* @private
-* @param {string} str - string to escape
-* @returns {string} escaped string
-*/
-function escapeRegex( str ) {
-	return replace( str, RE_SPECIAL_CHARS, '\\$&' );
-}
-
 /**
 * Gets or creates a cached regex for finding return annotations.
 *
@@ -83,7 +72,7 @@ function getAnnotationRegex( annotationType, value ) {
 	var pattern;
 	var key;
 
-	escapedValue = escapeRegex( value );
+	escapedValue = escapeRegExpString( value );
 	key = [ annotationType, escapedValue ].join( '::' );
 
 	if ( !regexCache[ key ] ) {
@@ -336,7 +325,7 @@ function processExampleCode( code, commentIdx, comments, scope, report, opts, so
 
 					// Find annotation part in the match (after "// "):
 					annotationStart = arr[ 0 ].indexOf( '// ' ) + 3;
-					annotationEnd = arr[ 0 ].length - arr[ 5 ].length;
+					annotationEnd = arr[ 0 ].length;
 					loc.range = [
 						commentStartIdx + codeIdx + annotationStart,
 						commentStartIdx + codeIdx + annotationEnd