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extract sub-string from string (use as single token)
{mpf:sub=xtestx||start=1||length=4}
extract sub-string from string (use with closing token)
{mpf:sub||start=1}
... the first character of this string will not be displayed ...
{/mpf:sub||start=1}
store extracted sub-string in myVar (use as embedded token)
{mpf:set=myVar||{mpf:sub=test}}
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