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When You have a replace and you want to replace text with something that contains $ You get a malformed replacement string (interpreter thinks its a variable reference). The $$ doesn't work.
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To use RegEx, the first argument of replace will be replaced with regex syntax, for example /regex/ . This syntax serves as a pattern where any parts of the string that match it will be replaced with the new substring. The string 3foobar4 matches the regex /\d. *\d/ , so it is replaced.
As featured in Regular Expression Syntax Reference - you can use \\$ to escape $ sign.
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\ $1
if IDE from JetBrains you need type space character between slash and sign dollar
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