Expanding the functionality of a regular expression

Question

Expanding the functionality of a regular expression

My goal is to identify JavaScript files located within the /static/js directory that have a query string parameter at the end, denoted by ?v=xxxx, where 'x' can be any character or number. Here's an example of a match:

http://127.0.0.1:8888/static/js/components/backbone.js?v=a6tsb

But these should not be considered matches:

http://127.0.0.1:8888/static/js/views/ribbon.js
http://127.0.0.1:8888/templates/require-config.js

The regular expression below successfully captures the desired hash pattern:

var hashRegex = new RegExp("^.*\\?v=\\w{5}$");

However, I am attempting to modify it to specifically target files within the "/static/js" directory.

I initially tried this modification:

var hashRegex = new RegExp("^.*\/static\/js\/.*\\?v=\\w{5}$");

Unfortunately, this adjustment doesn't seem to work as intended. What could I be overlooking?

javascript regex

Answer 1

Answer №1

When representing regex in JavaScript as a string, special characters need to be double escaped (\\)

Therefore, your regex should be:

var hashRegex = new RegExp("^.*/static/js/.*\\?v=\\w{5}$");

However, if you prefer the simpler syntax for regex:

var hashRegex = /regex/;

You would need to escape with a single \, and also escape / since it is used as a delimiter.

In this case, your regex would be:

var hashRegex = /^.*\/static\/js\/.*\?v=\w{5}$/;

Answer 2

When representing regex in JavaScript as a string, special characters need to be double escaped (\\)

Therefore, your regex should be:

var hashRegex = new RegExp("^.*/static/js/.*\\?v=\\w{5}$");

However, if you prefer the simpler syntax for regex:

var hashRegex = /regex/;

You would need to escape with a single \, and also escape / since it is used as a delimiter.

In this case, your regex would be:

var hashRegex = /^.*\/static\/js\/.*\?v=\w{5}$/;

Answer 3

Answer №2

One possible solution could be:

let hashPattern = new RegExp("^.*\/static\/js\/.*\?v\=[a-zA-Z0-9]{5}$");

(It might be necessary to escape the equals sign)

Answer 4

One possible solution could be:

let hashPattern = new RegExp("^.*\/static\/js\/.*\?v\=[a-zA-Z0-9]{5}$");

(It might be necessary to escape the equals sign)

Expanding the functionality of a regular expression

Answer №1

Answer №2

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