replace - RegEx Notepad++ -

i have series of line in following format:

               line:  5190 stno:  22669  si: voice           cct   line    stno  si    bus type           003   6269                opti                 multline 8. . . . . . . . . . . . . . .            001 subunit . . . . . digite main      defil/trs            (alt_rout: n)       (optiip  )                line:  5291 stno:  29956  si: voice 

what need find through regex (notepad++) numbers after "stno:"

there approximately 100 of such matches.

i tired stno:\s+\d{4,5} taking stno match not want. please help.

i need keep matched result , rest want delete or copy matched items new file whichever easier.

i suggest 2 step approach. first lines stno , number. second remove except number.

select mark tab in find dialogue. ensure bookmark line ticked. in find what box enter stno:\s*\d+ , click mark all.

access menu => search => bookmark => copy bookmarked lines. paste buffer. alternatively, work in same file use menu => search => bookmark => remove unmarked lines. should have wanted lines in buffer.

do regular expression search , replace setting find what ^.*stno:\s*(\d+).*$ , replace with \1. click replace all.

the above assumes there 1 number found per line.

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as numbers wanted, method put line breaks plus marker around wanted numbers, delete lines without marker, delete markers.

let marker keep. search , replace setting find what keep , replace with single space character, make sure match case not selected; click replace all. next, regular expression search , replace setting find what ^stno:\s*(\d+) , replace with \r\nkeep\1\r\n. might want match case ticked; click replace all. next mark lines (as described above) find what set keep, followed menu => search => bookmark => remove unmarked lines. finally, search , replace setting find what keep , replace with empty.