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Regular expression

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  Regular expression "Tony Johansson" <johansson.andersson@telia.com> - 2015-03-15 22:25 +0100
    Re: Regular expression Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-03-15 21:38 +0000
    Re: Regular expression Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2015-03-15 23:40 +0100

#27055 — Regular expression

Can somebody explain this regular expression
document.getElementById('rovarsprak').value.replace(/([bcdfghjklmnpqrstvwxz])o\1/gi, 
'$1');

//tony 

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#27056

"Tony Johansson" <johansson.andersson@telia.com> writes:

> Can somebody explain this regular expression
<snip> 
  replace(/([bcdfghjklmnpqrstvwxz])o\1/gi, '$1');

Match any one of bcdfghjklmnpqrstvwxz -- that's what the []s mean.
I.e. match a single non-vowel (taking y to be a vowel too).

Remember this matched letter -- that's what the ()s mean.

Match a single 'o'.

Match the non-vowel seen before -- that's what the \1 means.

Do this globally (i.e. repeat for very match) -- that's the 'g' -- and
ignoring case -- that's the 'i'.

For every such match, replace it with the single-letter non-vowel.  '$1'
in a replacement string means the first captured match.

-- 
Ben.

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#27057

On 2015-03-15 22:25, Tony Johansson wrote:
> Can somebody explain this regular expression
> document.getElementById('rovarsprak').value.replace(/([bcdfghjklmnpqrstvwxz])o\1/gi,
> '$1');

The other way (apart of Ben's explanation) to explain that (and others 
as well) regular expression might be to use nice tool: 
https://regex101.com/r/qR9nN4/1

-- 
Cezary Tomczyk
http://www.ctomczyk.pl/

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