Select a character if some character from a list is before the character

Question

I have this regular expression:

/([a-záäéěíýóôöúüůĺľŕřčšťžňď])-$\\s*/gmi

This regex selects č- from my text:

s         


        

Answer 1

In other languages you would use a lookbehind

/(?<=[a-záäéěíýóôöúüůĺľŕřčšťžňď])-$\s*/gmi

This matches -$\s* only if it's preceded by one of the characters in the list.

However, Javascript doesn't have lookbehind, so the workaround is to use a capturing group for the part of the regular expression after it.

var match = /[a-záäéěíýóôöúüůĺľŕřčšťžňď](-$\s*)/gmi.match(string);

When you use this, match[1] will contain the part of the string beginning with the hyphen.