Question

I am trying to come up with a regular expression to match a particular pattern.

If a sample test string is as follows:

/wp-content/themes/sometheme/style.css

The regular expression should:

1. MATCH /wp-content/themes/ exactly, from the beginning, and should also match /style.css exactly, from the end.
2. NOT MATCH, when the remainder (between the beginning and end strings in item 1) is rwsarbor
3. MATCH, when the remainder is anything BUT mythemename
4. For the dynamic part in the middle, it should match any number of characters, and any character type (not just a-z, 0-9, etc)

For example, it should not match:

/wp-content/themes/mythemename/style.css

It should match

/wp-content/themes/jfdskjh-ekhb234_sf/style.css
/wp-content/themes/another_theme/style.css
/wp-content/themes/any_other-theme/style.css
/wp-content/themes/!@#$%^&*()_+{}|:"?</style.css

This one is a little out of my league in terms of complexity, so I am looking to the community for assistance.

Answer 1

Try this :

^/wp-content/themes/(?!mythemename).*/style.css$

Demo : http://regexr.com?30ote

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Hint : Using Negative look-ahead assertion.