RegEx matching $1 tokens

Asked Apr 08 '21 at 23:12

Active Apr 08 '21 at 23:12

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lets suppose I have the following string "$1 $1 10 20 $11 3$1 30 $1 10 $1"

I want to replace $1 whenever it is in the beginning of the string, end of string or between two spaces. As an example, replacing $1 with 10, would produce: "10 10 10 20 $11 3$1 30 10 10 10"

I am trying with the following expression: "(\s\$1\s)|(^\$1\s)|(\s\$1$)"

Unfortunately, I'm not able to match the 2nd $1, as the space character seems to be captured by the first match. The result with this expression is: "10 $1 10 20 $11 3$1 30 10 10 10"

I am not experienced with regex, and I'm probably missing something here. How can i correct the expression? (Java) thank you

asked Apr 08 '21 at 23:12

hugo paparazzo

You can use `"(?<!\\S)\\$1(?!\\S)"`. Or, `text.replaceAll("\\s*(?<!\\S)\\$1(?!\\S)", "").trim()` – Wiktor Stribiżew Apr 08 '21 at 23:15
1

thanks - that first expression seems to work! – hugo paparazzo Apr 08 '21 at 23:43

RegEx matching $1 tokens

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