word replacing in a paragraph

[Frank Cui]

Hey guys,
I'm trying to automate a process by initially creating a standard template and then replace some text fields with variable values.
[for example, "DATE" in the paragraph will be replaced by the current date value. it doesn't have to be a literal word of "DATE", "DATE" in "TESTDATE" can also be replaced.]
Is there some lightweight built-in or 3rd party  libraries which are good for such kind of work ?
ThanksFrank  		 	   		  
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