Benchmark: RegEx.exec vs String.match 22222

Script Preparation code:

var string = "10-04-2024 09:02:11.593 [http-nio-8080-exec-956 ri: ti: 3a27d92ea78e558d si: 3a27d92ea78e558d] TRACE o.h.type.descriptor.sql.BasicBinder.bind - binding parameter [2] as [VARCHAR] - [S]";
var regex = /.*?\[([^ ]*) *ri:(.*) ti: (.*) si:(.*?)] *([^ ]*) *([^ ]*) - (.*)/;

Tests:

regex.exec
regex.exec(string);
string.match
string.match(regex);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regex.exec
string.match

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser/OS: Chrome 122 on Linux

View result in a separate tab

Test name	Executions per second
regex.exec	1561243.0 Ops/sec
string.match	1523771.2 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

The provided JSON represents two benchmark test cases: `regex.exec` and `string.match`. Both tests aim to compare the performance of regular expression execution (using `exec`) versus string matching (using `match`). The benchmark is designed to measure which approach is faster for a specific pattern (`.*?\\[([^ ]*) *ri:(.*) ti: (.*) si:(.*?)] *([^ ]*) *([^ ]*) - (.*)/`).

**Options Compared:**

1. **Regex.exec**: This method executes the regular expression on the provided string and returns an array containing match data.
2. **String.match**: This method searches the entire string for a match to the given regular expression pattern and returns an array of matches.

**Pros and Cons:**

* **Regex.exec**:
	+ Pros:
		- Can stop processing as soon as a match is found, which can be beneficial in terms of performance.
		- Returns an array containing match data, which can be useful for further processing.
	+ Cons:
		- May have slower execution times due to the overhead of creating and executing the regular expression engine.
		- Can lead to more memory usage if the input string is large.
* **String.match**:
	+ Pros:
		- Generally faster than `Regex.exec` since it doesn't require the creation and execution of a separate regular expression engine.
		- Typically uses less memory, especially for large input strings.
	+ Cons:
		- May lead to slower performance if the pattern is complex or the input string is large, as it may require more processing time to find matches.

**Library and Purpose:**

In the provided benchmark JSON, there is no explicit library mentioned. However, both `Regex.exec` and `String.match` rely on the JavaScript engine's built-in support for regular expressions.

**Special JS Feature or Syntax:**

The provided pattern contains several special features:

* `.*?`: A lazy match (non-greedy) that matches any character (.) as few times as possible.
* `\\[`: An escaped '[' character, which is necessary because '[' has a special meaning in regular expressions.
* `([^ ]*)`: A capture group that matches one or more non-space characters. The parentheses around the pattern create a named capture group (`ri`, `ti`, etc.) for further processing.

**Alternatives:**

Other alternatives to compare the performance of `Regex.exec` and `String.match` might include:

* Using a different regular expression engine, such as [PCRE](https://www.pcre.org/), which can provide more advanced features but may also increase overhead.
* Implementing custom string matching algorithms using JavaScript's built-in functions (e.g., `indexOf()`, `includes()`) or external libraries like [regex.js](https://github.com/mathiasbynkers regex.js).
* Comparing the performance of different JavaScript versions or environments, as execution times can vary between them.

I hope this explanation helps you understand what's being tested in this benchmark and provides valuable insights for software engineers working with JavaScript.

Related benchmarks:

RegEx.exec vs String.match 22222 (version: 0)

Proviamoci

Comparing performance of: regex.exec vs string.match

Created: 2 years ago by: Guest

Jump to the latest result

regex.exec

string.match

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):