Benchmark Overview

The provided JSON represents a JavaScript microbenchmark, where users can compare the performance of different approaches to test regular expressions in a specific HTML string.

Script Preparation Code

The script preparation code is used to create the input HTML string:

var html = "<p>A</p><table><tr><td>1</td><td>2</td></tr></table><p>B</p>";

This string contains a table with some text, which will be used as the test data for the regular expression tests.

Html Preparation Code

The HTML preparation code is empty, indicating that no additional HTML strings need to be generated for the benchmark.

Individual Test Cases

There are four individual test cases:

1. test: /<table\\b[^>]*>/i.test(html)
   • This test uses the test() method of the regular expression object.
   • It tests whether the input string matches the pattern, with the i flag for case-insensitive matching.
2. exec: /<table\\b[^>]*>/i.exec(html)
   • This test uses the exec() method of the regular expression object.
   • It attempts to find the first match of the pattern in the input string and returns a result.
3. match: html.match(/<table\\b[^>]*>/i)
   • This test uses the match() method of the String object.
   • It searches for all occurrences of the pattern in the input string and returns an array of matches.
4. indexOf: html.toLowerCase().indexOf('<table')
   • This test uses the toLowerCase() method to convert the input string to lowercase and then uses the indexOf() method to find the index of the first occurrence of '<table'.

Libraries and Features

None of these tests use any external libraries or special JavaScript features.

Pros and Cons of Different Approaches

1. test(): This approach is simple and efficient, as it only requires a single pass through the input string.
   • Pros: Fast and lightweight.
   • Cons: May not be suitable for large input strings or complex patterns.
2. exec(): This approach can return more information about the match, such as the start position and the matched text.
   • Pros: Can provide more detailed results than test().
   • Cons: May be slower due to the additional overhead of returning a result object.
3. match(): This approach returns an array of all matches in the input string, which can be useful for certain use cases.
   • Pros: Can return multiple matches and is suitable for searching large input strings.
   • Cons: May be slower than test() due to the additional overhead of creating an array.
4. indexOf(): This approach uses a simpler search algorithm that only searches for the first occurrence of the pattern.
   • Pros: Fast and lightweight, but may not be suitable for finding all occurrences.
   • Cons: May not be suitable for complex patterns or large input strings.

Other Alternatives

1. regex.test() vs. test(): These two methods are similar, but regex.test() is a static method that can be called without creating an object.
2. String.prototype.match() vs. match(): Both methods return an array of matches, but String.prototype.match() uses the g flag for global matching, which may affect performance.
3. indexOf() vs. search(): While both methods search for a substring in a string, indexOf() is more general and can be used to search for any character sequence, whereas search() only searches for a single substring.

Overall, the choice of approach depends on the specific requirements of the use case, such as performance, simplicity, or the need to return detailed results.