Help with replacing a text with regex

Question

I have the following text in a file called build.xml:

component.rollup=true
component.rollup.modules.buildfiles=io-base.xml, io-form.xml, io-xdr.xml
component.rollup_dir=/base

I want it to add one file in it so it will become:

component.rollup=true
component.rollup.modules.buildfiles=io-base.xml, io-form.xml, io-xdr.xml, io-extended.xml
component.rollup_dir=/base

How can I do that with regex?

I'm using javascript.

Thanks!

EDIT:

Forgot to tell you that the files are not static, they may change. Only

component.rollup.modules.buildfiles=

will always be there.

@Michael, IE allows this through ActiveX, or it could be server-side JS, e.g. node.js or Rhino. — David Tang
– David Tang, Commented Jun 10, 2011 at 4:56

maerics · Accepted Answer · 2011-06-10 05:11:37Z

2

Assuming you have already read the contents of the file:

fileContents.replace(
  /^(component\.rollup\.modules\.buildfiles\s*=.*)$/m,
  '$1, io-extended.xml');

edited Jun 10, 2011 at 5:11

answered Jun 10, 2011 at 4:59

maerics

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4 Comments

GregL Over a year ago

The only potential problem with this is that if it is run more than once it will keep adding the io-extended.xml file to the list. Hence why I made sure in my answer that the line ended in io-xdr.xml.

David Tang Over a year ago

+1 good answer, but you should include the = after buildfiles to be safe.

maerics Over a year ago

@GregL: true, I suppose the regex could do a negative lookahead assertion for the "io-extended.xml" filename. Note that from OP's update I don't think it's safe to assume that any filenames are present though.

GregL Over a year ago

Or you could just do a simple .match() check first as I did in my answer. Easier to understand, I find, if a little less technically impressive.

GregL · Accepted Answer · 2011-06-10 05:06:15Z

1

Try this (assuming the variable with the XML contents in it is called myXmlContent):

if (!myXmlContent.match(/^component\.rollup\.modules\.buildfiles=.*io-extended\.xml/im) {
    myXmlContent = myXmlContent.replace(/^(component\.rollup\.modules\.buildfiles=.*)$/im, '$1, io-extended.xml');

This will ensure it isn't added twice.

edited Jun 10, 2011 at 5:06

answered Jun 10, 2011 at 4:58

GregL

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