regex - Find a line with leading and/or trailing space(s) -

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create regular expression find line leading and/or trailing space(s).

guys, have no idea how start. care lighten me up?

to see if such lines exist, can use simple regex (see online demo):

^ | $

to match lines, use (see online demo):

^(?: .*$|.* $)

to match spaces, use (see online demo):

^ +| +$

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