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display trimmed string
{mpf:trim=left||data= hello}
trim section (use with closing token)
{mpf:trim=both}
... whitespaces at beginning and end of this string will be removed ...
{/mpf:trim=both}
store trimmed data in myVar (use as embedded token)
{mpf:set=myVar||{mpf:trim=left||data= hello}}
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