[%- text = "The cat sat on the mat" %]
[%- text FILTER replace(' ', '_') %]
[% text FILTER replace('sat', 'shat') +%]
[% text | replace('at', 'plat') +%]
[% text = 'The <=> operator, blah, blah' %]
[%- text | html | replace('blah', 'rhubarb') %]