Is it possible to change the case AND change spaces to underscores using Low Variables?

Basically I was trying to use...

{exp:low_replace find='\s+|\w+' replace='_|\l+' regex='yes' multiple='yes'}Flavours yo{/exp:low_replace}

But I tihnk I may have got the RegEx completly wrong (Not my strong point!)

Because this just outputs


1 Answer 1


First off, I don't think Low Replace supports multiple="yes" for regex replacements. Considering the complexities allowed in regex expressions, it would be a difficult task indeed to allow Replace A|B|C with X|Y|Z type regex searches when each of A|B|C are individual regex searches.

I also don't see any Low Replace functionality to do the replace with case transforms. In straight regex it's pretty simple: prefix your replacement with \U (or something very similar, depending on your regex flavor), but Low's only implementing a regex subset, it seems. No matter the syntax I tried, I was not able to get the replacement to change case. Of course, I could be missing something obvious, wouldn't be the first time (see some of my questions here on the Stacks. ;-) If the resulting text does not actually have to BE uppercase, but can rather just look uppercase, then how about a little CSS text-transform:uppercase?

So, we're left with the basic replacement of spaces to underscores. That's achievable with

{exp:low_replace find="([\w\W+]) +" replace="$1_" regex="yes"}
  Lorem ipsum dolor sit amet. Nearly.

You will note that the search is for both alpha-numeric characters (\w) as well as non-alpha-numerics (\W). This is to factor for the possibilities of commas, periods, etc. If you know that your case will never encounter these, you can leave the statement as

{exp:low_replace find="(\w+) +" replace="$1_" regex="yes"}
  Lorem ipsum dolor sit amet. Nearly.

The first statement results in


The second statement results in

Lorem_ipsum_dolor_sit_amet. Nearly.

(note the missing underscore before 'Nearly.')

Now, for what it's worth, there's a utility by Causing Effect by the name of CE String that just completely kicks ninja string manipulation arse. For $10 it's a Bat Utility Belt of string manipulation the likes of which are endlessly joyous for a nerd. Worth a look. The beauty of it is that you can pile up your manipulations, so, say, do your regex search/replace, then UPPERCASE the whole thing.


  • Wow, thanks @dashard amazing reply. Sadly I can't use CSS for the case change, it's not for the styling, but more for some form names. I'll try CE String, I have used this in the past but always fall back to Low Replace. Thanks.
    – Jason Mayo
    Commented Jun 20, 2014 at 10:36

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