MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › String › match
String.prototype.match() - JavaScript | MDN
The input property is the original string that was parsed. The following example demonstrates the use of the global flag and ignore-case flag with match(). All letters A through E and a through e are returned, each its own element in the array. ... const str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; const regexp = /[a-e]/gi; const matches = str.match(regexp); console.log(matches); // ['A', 'B', 'C', 'D', 'E', 'a', 'b', 'c', 'd', 'e']
Stack Overflow
stackoverflow.com › questions › 5296268 › fastest-way-to-check-a-string-contain-another-substring-in-javascript
regex - Fastest way to check a string contain another substring in JavaScript? - Stack Overflow
I'm working with a performance issue on JavaScript. So I just want to ask: what is the fastest way to check whether a string contains another substring (I just need the boolean value)? Could you pl...
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Search a String by matching against a regex in JavaScript - YouTube
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Global Regular Expression (Regex) Searches - JavaScript Tutorial ...
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String includes() - YouTube
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › String › includes
String.prototype.includes() - JavaScript | MDN
const sentence = "The quick brown fox jumps over the lazy dog."; const word = "fox"; console.log( `The word "${word}" ${ sentence.includes(word) ? "is" : "is not" } in the sentence`, ); // Expected output: "The word "fox" is in the sentence" ... A string to be searched for within str. Cannot be a regex.
Mozilla
developer.mozilla.org › en-US › docs › Web › JavaScript › Guide › Regular_expressions
Regular expressions - JavaScript | MDN
To include a flag with the regular expression, use this syntax: js · const re = /pattern/flags; or · js · const re = new RegExp("pattern", "flags"); Note that the flags are an integral part of a regular expression. They cannot be added or removed later. For example, re = /\w+\s/g creates a regular expression that looks for one or more characters followed by a space, and it looks for this combination throughout the string.
W3Schools
w3schools.com › jsref › jsref_match.asp
JavaScript String match() Method
break class const continue debugger do...while for for...in for...of function if...else let return switch throw try...catch var while JS Strings · at() charAt() charCodeAt() codePointAt() concat() constructor endsWith() fromCharCode() includes() indexOf() isWellFormed() lastIndexOf() length localeCompare() match() matchAll() padEnd() padStart() prototype repeat() replace() replaceAll() search() slice() split() startsWith() substr() substring() toLocaleLowerCase() toLocaleUpperCase() toLowerCase() toString() toUpperCase() toWellFormed() trim() trimEnd() trimStart() valueOf() JS Typed Arrays ·
SitePoint
sitepoint.com › javascript
Is there a way to use RegEx with the Javascript includes() function? - JavaScript - SitePoint Forums | Web Development & Design Community
May 5, 2018 - var locations = [ 'Philippines', 'Singapore', 'China', 'New York' ]; var results = locations.filter(function(location) { return location.includes('e'); }); console.log(results); What I am trying to do with t…
SitePoint
sitepoint.com › blog › javascript › quick tip: testing if a string matches a regex in javascript
Quick Tip: Testing if a String Matches a Regex in JavaScript — SitePoint
November 6, 2024 - When you’re testing if a string ... expressions is a better option. JavaScript regex matching allows you to check if a string contains a specific pattern, substring, or types of characters....
Top answer 1 of 2
19
You can use .test() on your regular expression to check whether the pattern matches part of the string. As the pattern will need to match only a portion of the string, you will need to remove the ^ and $ characters as your matched pattern can be contained within a line. Also, there is no need to escape the character class bracket as you have tried to do so in your expression (\[), as you want the [ to be treated as a character class, not a literal square bracket:
const myString = "This is my test string: AA.12.B.12 with some other chars";
const res = /[A-Z]{2}\.\d{2}\.[A-Z]{1}\.\d{2,3}/.test(myString);
console.log(res); 2 of 2
5
If we look at the docs for String.prototype.includes() we can see it takes a string, not a regular expression. Instead, try RegExp.prototype.test().
Also, since you only want to match a sub-string, you'll need to remove the start and end anchors ^ and $. (More on regex anchors)
Your code becomes:
var myString = "This is my test string: AA.12.B.12 with some other chars";
var myRegex = /[A-Z]{2}\.\d{2}\.\[A-Z]{1}\.\d{2,3}/;
console.log(myRegex.test(myString));
JavaScript.info
javascript.info › tutorial › regular expressions
Methods of RegExp and String
The method str.match(regexp) finds matches for regexp in the string str.
MeasureThat
measurethat.net › Benchmarks › Show › 13675 › 0 › regextest-vs-stringincludes-vs-stringmatch
Benchmark: RegEx.test vs. String.includes vs. String.match - MeasureThat.net
RegEx.test vs. String.includes incasesensitive
ReqBin
reqbin.com › code › javascript › vy4txenr › javascript-string-contains-example
How do I check if a string contains a substring in JavaScript?
To check if a string contains a substring in JavaScript, use the string.includes(term, start) method, which checks if the string contains the substring. The first parameter is the string to search for, and the second optional parameter specifies ...
Honeybadger
honeybadger.io › blog › javascript-regular-expressions
The ultimate JavaScript regex guide - Honeybadger Developer Blog
May 9, 2025 - The code above creates a pattern that matches phone numbers, a string that includes two phone numbers in the format specified by the pattern, and a while loop that iterates over all matches found by the exec method and logs each match to the console. The code above will return the following: The search method typically works on all strings, but you can also use it to test regex patterns:
W3Schools
w3schools.com › jsref › jsref_includes.asp
JavaScript String includes() Method
cssText getPropertyPriority() getPropertyValue() item() length parentRule removeProperty() setProperty() JS Conversion · ❮ Previous JavaScript String Reference Next ❯ · Check if a string includes "world": let text = "Hello world, welcome to the universe."; let result = text.includes("world"); Try it Yourself » ·
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › String › search
String.prototype.search() - JavaScript | MDN
The search() method of String values executes a search for a match between a regular expression and this string, returning the index of the first match in the string. const paragraph = "I think Ruth's dog is cuter than your dog!"; // Anything not a word character, whitespace or apostrophe const regex = /[^\w\s']/g; console.log(paragraph.search(regex)); // Expected output: 41 console.log(paragraph[paragraph.search(regex)]); // Expected output: "!"
Love2Dev
love2dev.com › blog › javascript-includes
JavaScript Includes To Search 🔍 In Strings & Arrays
The JavaScript 👨💻 includes method finds 🔍 the target in an Array or String. Learn how to search arrays and strings to determine if they contain your item.
CodingNomads
codingnomads.com › match-string-javascript
JavaScript String Matching
Explicitly creating RegExp objects does give you the opportunity to add things like flags. With your regular expression in hand, you can now use it to find matches in the text. First off, you may want to find out if the text contains an e-mail at all. First up, you'll see if a string contains a substring using the .search() method.
Stack Abuse
stackabuse.com › javascript-check-if-string-contains-a-substring
JavaScript: Check if String Contains a Substring
September 6, 2023 - As you can see, a boolean value is returned since the string "stack" is a substring of stackabuse. This is a case sensitive search, so the following will not match the substring: > let str = 'StackAbuse'; > let substr = 'stack'; > str.includes(substr); false
W3docs
w3docs.com › javascript
How to Check Whether a String Matches a RegEx in JavaScript
Regex are objects in JavaScript. Patterns are used with RegEx exec and test methods, and the match, replace, search, and split methods of String. The test() method executes the search for a match between a regex and a specified string.
Eloquent JavaScript
eloquentjavascript.net › 09_regexp.html
Regular Expressions :: Eloquent JavaScript
In some cases you may not know the exact pattern you need to match against when you are writing your code. Say you want to test for the user’s name in a piece of text. You can build up a string and use the RegExp constructor on that.
Jsben
jsben.ch › string-includes-vs-regex-test-8yj6f
string includes vs regex test
Free online JavaScript benchmark tool. Compare code snippets, measure performance, and find the fastest solution for your JavaScript code.