Bash - sub,gsub

regex Using: sub , gsub -> (Global sub)

• sub (pattern, replacement, x)
• gsub (pattern, replacement, x)

sub ("little", "big", "Mary has a little lamb.") 
# Substitutes ONLY the first occurrence of the word "little" by another word "big".

“Mary has a big lamb.”

• sub(pattern, replacement, x, ignore.case = FALSE, fixed = FALSE, useBytes = FALSE)

• gsub(pattern, replacement, x, ignore.case = FALSE)

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