Use a regular expression in ultraedit

Delete empty rows: replace % [^ t] ++ ^ P with empty strings.

Remove trailing space: Replace [^ t] + $ with an empty string

Space at the beginning of the row to be deleted: % [^ t] + is replaced with an empty string

Each line starts with four fixed spaces: replace % [^ t] ++ ^ ([~ ^ T ^ p] ^) is "^ 1"

Each segment starts with a fixed 4-digit space: replace % [^ t] + ""
(If a line starts with a space, it is regarded as the starting line of a segment)

Merge a segment into one row: Replace [^ t] ++ ^ P ^ ([~ ^ T ^ p] ^) is ^ 1
(Note: here we assume that the text is a line break in DOS mode-Cr/LF)

Remove HTML Tag: replace ^ {<*> ^} ^ {<* ^ p *> ^} with an empty string.

Delete all <A>: replace <[] ++ A * [] ++ href [] ++ = *> with an empty string.

Delete the first two columns of characters specified in the text: replace % ?? Empty string

Insert 2 blank characters after the first column: replace % ^ (???? ^) ^ (? ^) Is "^ 1 ^ 2"

Search for all numbers: [0-9] + [.] ++ [0-9] +

Find all words: [A-Z] +

Find all urls: http: // [a-z0-9 ^ ~ '_./^-^? = &] +

Note: to replace the regular expression, you must check the regular expression option.