sed命令用正则表达式替换

Question

I have been bashing my head against the wall trying to get sed to search a file are replace a timestamp.

example replace strings (file):

<script src="<@ofbizContentUrl>/xxx/js/v6/jsfile.js?v=201711271300</@ofbizContentUrl>"></script>

<script src="<@ofbizContentUrl>/xxx/js/v6/jsfile2.js?v=20171127245</@ofbizContentUrl>"></script>

basically I want to replace the 201711271300 in the examples with the current timestamp which i have saved in a variable date. The dates in the example differ from case to case.

I've been trying

sudo sed -i "s/?v=.+?(?=<)/?v=${date}/g" file

to no avail, going on 2 hours now

Answer 1

Try this one

sed "s/?v=\([0-9]*<\)/?v=${date}</g" $file

It uses a simpler pattern: all digits until you hit a < . Replace by a data (and restore the < ).