Insert underscore into the string

a = datestr(now,31)

a = 2016-08-23 09:15:47

a = regexprep(a,'[^a-zA-Z0-9]','') = 20160823091547

a(1:2) = []

a = '160823091547'

Now i need to insert the underscore after the sixth element in the string

160823_091547

how can i do this?

is it possible to optimize the above steps or my approach is correct?

Thanks a lot

Answer 1

[Guillaume]

Using regexprep, this would be one of the many ways to do it:

a = regexprep(datestr(now, 31), '..(..)-(..)-(..) (..):(..):(..)', '$1$2$3_$4$5$6')

But even simpler, why not ask datestr to output exactly what you want directly:

a = datestr(now, 'yymmdd_HHMMSS')

Answer 2

[Azzi Abdelmalek]

a=[a(1:6) '_' a(7:end)]

Answer 3

[Azzi Abdelmalek]

a = datestr(now,31)
a=datestr(a,'yymmdd_HHMMSS')