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[JS] Variable-bound Case-insensitive global string replace?

 
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Trow
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PostPosted: Mon Feb 08, 2010 10:51 am    Post subject: [JS] Variable-bound Case-insensitive global string replace? Reply with quote
Hi,

Normally, if you want to perform a string replacement in javascript, you do:
Code:
str=str.replace("what","lol");

but this is both case-sensitive and happens only for the first occurance of the term.

To do a case-insensitive global string replacement, there is regex:
Code:
str=str.replace(/what/gi,"lol");

and it works well.

Problem is, what should you do if you want a variable to be used inside the regex expression? The following are examples of things that don't work.
Code:
str=str.replace(/variablename/gi,"lol");
str=str.replace("/variablename/gi","lol");
str=str.replace("/" + variablename + "/gi","lol");

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shhac
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PostPosted: Mon Feb 08, 2010 1:10 pm    Post subject: Reply with quote
You can create regular expressions from strings (though usually it is better to use the /reg/ notation so only use this if the expression must be generated via string), for example,
Code:
re = new RegExp("foo"+variable+"bar","gi");
str = str.replace(re,"lol");
Remember to escape backslashes because this method uses a string and not direct typing of a RegEx.
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Trow
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PostPosted: Mon Feb 08, 2010 5:19 pm    Post subject: Reply with quote
works like a charm. thanks!
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