[css] Using regular expression in css?

I have an html page with divs that have id(s) of the form s1, s2 and so on.

<div id="sections">
   <div id="s1">...</div>
   <div id="s2">...</div>
   ...
</div>

I want to apply a css property to a subset of these sections/divs (depending upon the id). However, every time I add a div, I have to add the css for the section separately like this.

//css
#s1{
...
}

Is there something like regular expressions in css that I can use to apply style to a set of divs.

I usually use * when I want to get all the strings that contain the wanted characters.

* used in regex, replaces all characters.

Used in SASS or CSS would be something like [id*="s"] and it will get all DOM elements with id "s......".

/* add red color to all div with id s .... elements */

div[id^="s"] {
    color: red;
}

First of all, there are many, many ways of matching items within a HTML document. Start with this reference to see some of the available selectors/patterns which you can use to apply a style rule to an element(s).

http://www.w3.org/TR/selectors/

Match all divs which are direct descendants of #main.

#main > div

Match all divs which are direct or indirect descendants of #main.

#main div

Match the first div which is a direct descendant of #sections.

#main > div:first-child

Match a div with a specific attribute.

#main > div[foo="bar"]

there is another simple way to select particular elements in css too...

#s1, #s2, #s3 {
    // set css attributes here
}

if you only have a few elements to choose from, and dont want to bother with classes, this will work easily too.

Try my generic CSS regular expression

(([a-z]{5,6}.*?\))|([\d.+-]?)(?![a-z\s#.()%])(\d?\.?\d?)?[a-z\d%]+)|(url\([/"'][a-z:/.]*['")]\))|(rgb|hsl)a?\(\d+%?,?\s?\d+%?,?\s?\d+%?(,\s?\d+\.?\d?)?\)|(#(\w|[\d]){3,8})|([\w]{3,8}(?=.*-))

Demo https://regexr.com/4a22i

An ID is meant to identify the element uniquely. Any styles applied to it should also be unique to that element. If you have styles you want to apply to many elements, you should add a class to them all, rather than relying on ID selectors...

<div id="sections">
   <div id="s1" class="sec">...</div>
   <div id="s2" class="sec">...</div>
   ...
</div>

and

.sec {
    ...
}

Or in your specific case you could select all divisions inside your parent container, if nothing else is inside it, like so:

#sections > div {
    ...
}

You can' just add a class to each of your DIVs and apply the rule to the class in this way:

HTML:

<div class="myclass" id="s1">...</div>
<div class="myclass" id="s2">...</div>

CSS:

//css
.myclass
{
   ...
}

As complement of this answer you can use $ to get the end matches and * to get matches anywhere in the value name.

Matches anywhere: .col-md, .left-col, .col, .tricolor, etc.

[class*="col"]

Matches at the beginning: .col-md, .col-sm-6, etc.

[class^="col-"]

Matches at the ending: .left-col, .right-col, etc.

[class$="-col"]