Replace random number from string with regular expressions

Question

i need to replace the random string after underscore here is my code

var map_list_tmpl_pre = '<div>some odd</div><ul><li class="single_map_list" onClick="showlist(\'parent_id_3aXw\')"></li>
    <li class="single_map_list" onClick="showlist(\'parent_id_3aXw\')"></li>
    </ul>';

$(map_list_tmpl_pre).filter('.single_map_list').each(function(index, currentLink) {
    alert(currentLink.outerHTML.replace(/(parent_id_)[0-9][a-z][A-Z]/, 'parent_id_newID'));
});

duncan · Accepted Answer · 2014-09-11 12:48:39Z

2

Change [0-9][a-z][A-Z] to [0-9a-zA-Z]+

[0-9][a-z][A-Z] would mean one digit followed by one lowercase letter followed by one upper case letter, e.g. this would match:

5aA

but this wouldn't:

5Aa

So using your current example, it would match parent_id_3aX in the parent_id_3aXw string, and replace it so it ended up being parent_id_newIDw

Using [0-9a-zA-Z]+ means that one or more of the pattern would match (signified by the +. And it could be any character in the 0-9 and a-z and A-Z ranges, order wouldn't matter.

Alternatively, instead of having to specify both lowercase and uppercase ranges, you could simply add the i flag to make it case-insensitive:

replace(/(parent_id_)[0-9A-Z]+/i

Also you shouldn't need to wrap parent_id_ in parentheses, unless you're wanting to reference it later with a back-reference. This should also work:

replace(/parent_id_[0-9A-Z]+/i

edited Sep 11, 2014 at 12:48

answered Sep 11, 2014 at 12:36

duncan

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1 Comment

Harman Over a year ago

Great Working like charm :) Thanks Duncan

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