RegEx for SEO
RegEx for SEO

There are numerous advantages in incorporating RegEx for SEO and each of the following uses for RegEx have an advantage for SEO.

After a brief intro to RegEx we will show examples using easy to notice RegEx Examples

An Intro to RegEx

The advantage of knowing basic RegEx techniques is they apply across many languages, devices and software, making it the ultimate productivity tool. Learn one set of logic and applying it in many applications. All of these have advantages for SEO. The faster and more efficiently you work, the more effective your SEO. And less headaches trying manually find errors in code and text.

Once you get used to the cryptic short cuts it becomes quite logical. A great way to learn is to use a text editor that supports RegEx in search replace. Like learning to program, learning RegEx is faster the quicker are your iterations between trial and error. Sometimes RegEx is applied to a string and not an entire block of text, so some examples may not work on every device.

Special Characters

RegEx Matches Example
^ The caret serves two different purposes. It is a special character that denotes "the beginning of a line" and it is a "not" operator inside of [ ]s [^a-z]
Any character that is not lowercase a-z.
$ End of input or line \.$
In this case it is using the escape character in front of a . so it would find full-stops at the end of a line.
* Matches zero or more times the preceding character(s). on*
In this case it would find "on" and "code".
. Matches zero or more times the preceding character(s). an.
Matches "and" the phrase "branding is a business asset" but NOT an (if at the end of a line)
\b Find a match at the beginning of a word \bPART
In this case it would find part but NOT depart.
+ Matches one or more times the preceding character. t+
In this case it would find the t-shirt.
n Preceding character is matched exactly n times. t{2}
In would find pattern and https but not it.
| Either or seo|regex
In would find regex is good for seo.
\d Matches digits \d{1,2}
In would find 1 and 12

RegEx in a text editor

Using an advanced text editor is a great way to learn RegEx. Learn techniques that allow you to create better blogs, which are a cornerstone of good SEO.


Finds possible punctuation errors. Note this is my go to check for a blog, it does also highlight correct code like a domain name which should not be changed.

Note the () () indicate parameter 1 parameter 2 which you can use \1\2 in your replace to transfer the values found.


Step through tags < > in HTML.


RegEx in web programming languages

Can check for reserved characters and whitespace. Automate tasks like creating image names based on product names - automatically removing special characters

File_Name = File_Name.replaceAll("\\W", "-");

The above Java code replaces all examples of \W : A non-word character with a - in a specific Java String called File_Name.

In Java we escape the escape character hence \\W.


RegEx in operating systems

Many operating systems incorporate RegEx. Especially Unix and Linux operating systems used on web servers.  

Regex in JavaScript

var meString = "This is a string";
var newString = meString.replace(/i/g, "u");

newString now is "Thus us a strung" all "i"s replaced with "u".
The /g is a global flag on the regular expression to replace all occurrences.


RegEx in Google Analytics

RegEx is supported in Universal Analytics but not GA4. Universal Analytics is being faded out.


RegEx in Google Console

RegEx is available using Google Console Performance in Pages and Queries.


This query loads all queries with clicks or impressions with the word seo.

RegEx in Google Console

With Shopping Carts the number of queries can be massive. As an SEO sorting through which products should be enhanced can be very fruitful - "picking the low hanging fruit".

Measuring the results of your SEO via Google Console makes sense - and doing that very quickly with RegEx makes even more sense.


Regex in HTML forms for validation

You have a shopping cart that is limited to Australian post codes.




Full form input-:

<input id="Post_Code" pattern="^[0-9]{4}" name="Post_Code" type="text" placeholder="4217" value="" maxlength="4" required="">

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