Regex in javascript

Question

Please, help me. I have a variable lang and i know that after this variable must go characters -(.+); For example, i would have written it in C # so - regexString = lang + "-(.+);"; But in javascript this code not correct: str1 = str1.replace(lang+"-(.+);", replacement); because there must use /.../, but i don't know how to write correct

Answer 1

Try this:

var re = new RegExp(lang+"-(.+);");
str1 = str1.replace(re, replacement);

Answer 2

Use new RegExp(lang + '-(.+);')

Answer 3

There is a dynamic way to create regexps in javascript:

new RegExp(lang+'\-(.+)')

(I also escaped the -.)

So to do a replace:

str.replace(new Regexp(lang+'\-(.+)'), replacement)

If you want to replace more than 1:

str.replace(new Regexp(lang+'\-(.+)', 'g'), replacement)

The 'g' flag is for 'global'.