facebook How To Use Regex For SEO? [A Complete Guide]

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How To Use Regex For SEO?

SEO work gets refined with time. However, it is just the start with intelligent search and application of new and latest SEO techniques. This comprehensive guide will surely give programming knowledge and assist you in using Regex for SEO.

Regex is an uncomplicated, handy tool that one can learn quickly. However, we advise you to go through a complete block because we believe it is one of the best time versus result investments in your career.

What are Regular Expressions or Regex?

A regex is an essential tool for pattern matching. It plays a chief role in search engines as it helps find and replace the utilities, and the concept extends to different computer languages.

It also offers the opportunity to combine the "find" attribute with a web crawler. As a result, it acts as a potent tool in tracing errors and assisting in data extraction.

This feature is still new to SEO tactics and not widely utilized to boost the SEO reach to new platforms.

Custom extraction was only added to the screaming frog seo2 spider in July 2015 to increase the accessibility of Regex. But before that, Excel was the handiest tool for regex extraction and crawlers like screaming frogs to collect URLs first to analyze data.

Despite the widespread availability of regex functionality, many web professionals ignore this impressive feature's power.

One can learn Regex by diving right into the combination of streaming frog and some other tools.

  • RegEx
  • Regular Expressions 101
  • Txt2re
  • Build RegEx

Try out some of the listed above to master with a commendable feature of SEO.

Regex users make their task ok, handy, and more worthy by using some basic regular expressions.

  • "." Any character
  • ".*" 0 or more character
  • ".+" 1 or more character
  • "?" Optional character
  • "^" Beginning of a line
  • "$" End of a line
  • "\" Escape a unique character

Things become more relaxed when one uses a typical pattern on Google analytics. For example, a regex is a tool that is not oriented to any programming language. So standardly, Google analytics or programming in python, JavaScript, or java doesn't carry much importance because you only need some points to use regular expressions.

Regular expressions have distinct flavors which change according to the programming language. However, suppose you have acquired basic knowledge of any programming language and how to utilize general standard terms. In that situation, you need not apprehend as they can be used in any programming language.

Let's discover Regex

This blog will assist you in getting familiar with the fundamentals of Regex. But many have a myth that all Regex are equal. But this is incorrect as this is a tool employed with computer languages and data analysis.

It depends on the programming language as some regexes do not respond with some specific computer software.

Need to learn Regex for SEO

Many use regex as an employee Google analytics and data analysis to reach a final decision of insight.

Later they start using this feature for crawling and scraping purposes to advance their knowledge and carrier. Then they utilized this in making API calls regardless of geography. Finally, this is used to filter organic data.

Let's dive deeper into the basics of Regex

Match characters

With the use of flags, you can match one or multiple characters. Wildcards and other distinct sets of indications can also be used.

  • Dot "." Matches any character such as SE. will match SEO and SEM both.
  • [aeiou] will match multiple vowels such as t[ai]ll will map till and tall both.

Or / And Logic

It assists in merging multiple conditions in regular expressions using logical expressions.

If you want to add ALL conditions and valid, users can combine alternative AND  operators in the pattern.

Google  Analytics does not employ AND operators.


Quantity specifiers, also known as Quantifiers, inform the user about how frequently the character must be used. This represents the data about how many times the previous content can be matched.

  • "+" for one or more time
  • "{2}" for twice
  • "{3,5}" for three to five times
  • "*" for zero or more times
  • "?" for once or none

Negated character set

This is a fantastic option provided to users. As you can use this character set of those characters which you are not willing to include.

To design a negated character set, one should use a caret character inside a character set ([^]).

Positive and Negative Lookahead

Lookahead patterns help check the ways you had already specified. With taking help from this, you can enhance your string. Lookaheads are of two types.

  • Positive lookahead "(?=)."
  • Negative lookahead "(?!)"

Greedy and lazy matching

A greedy match finds the longest possible part from the string in a regular expression.

The lazy match is the opposite of a greedy match as it finds the smallest of all strings that satisfy Regex.

  • .* Is the example of the greedy match as it matches


  • ? Is lazy, which matches the heading tag.

Group elements of a Regex

Users can group the elements of Regex using () in a component which is referred to as a capture group.

Other Helpful Regex

(?<=[\/])\d{2,} Matches any numbered ID followed by a backslash.

^\s+|\s+$ choose all-white spaces at the Start and End of a string. This proves to be helpful while doing data manipulation.

(?<=\.)(.*?)(?=\.) Helps the user extract a domain name. This will match any string between two dots.

(?<=string)(.*) Matches anything after a string, excluding that string which is useful to clean up URLs.


Flags assist the user in determining the kind of character to match. Users might want to ignore this type of segregation when matching numbered words. To avail this availability by ending the Regex with a flag like google\i.

Here is the list of some functional and utility flags

  • \ I ignores case
  • \g matches more than one case
  • \d matches the digit from 0 to 9
  • \w matches ASCII letter, digit, or underscore. It is similar as [A-Za-z0-9_]\g
  • \s matches whitespace;
  • \D matches with that is not a digit from 0 to 9;
  • \W matches anything that is not an ASCII letter, digit, or underscores;
  • \S matches anything except whitespace

It is easy to double your reach and business by double your conversion rate by organic traffic, and Regex is one of the best tools which can assist in this vision.