The search doesn’t seem to find   in my posts

I need to change:

 
[content_block id=44726 suppress_content_filters="yes"]

to

[content_block id=44726 suppress_content_filters="yes"]

everywhere on my site. But the search doesn’t seem to be able to find anything when I search the first line of HTML. It’s only when I search for

[content_block id=44726 suppress_content_filters="yes"]

that it finds all my files with this HTML.

I can go through and find all the places where  
[content_block id=44726 suppress_content_filters="yes"] appears and edit them manually from the search results, but I’d love to be able to change this with the plugin directly.

Can you please help me?