regular expression for regex shell: escaping \

Question

can anyone help me with creating regex for escapging?

example1) shell> echo lll\\< kkkk\\\\\\ uuuu\\&

needs to print
lll< kkkk\\ uuuu&

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example2) shell> echo \\"Hello hello1 hello2"\\

"Hello hello1 hello2"

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excample3) shell> echo this is a question mark \\?

this is a question mark

Answer 1

You can use .+echo\\s|([\\\\?])\\1+|[\\\\?]

just you need replace this with $1

• '.+echo\\s' - With this you remove echo and all words before it

• '([\\?])\\1+' - get any \\ or ? that is duplicate and replace with one character by $1

• '[\\?]' - and remove any \\ and ? that is one

Online demo