Tips on avoiding issues with the backslash character in Typescript

Can someone help me with creating a regular expression in Typescript that can match the decimal separator character followed by a sequence of zeros in a string? I have tried to come up with an expression as shown below:

/\.0+\b/g

However, since the decimal separator is determined at run-time based on locale, I am constructing my expression in code using a variable called decimalSeperator:

"/\\" + decimalSeperator + "0+\b/";

My plan was to escape the double backslash characters to a single backslash character before running the expression. But when I compile the JavaScript code, the double backslashes are not being escaped:

"/\\" + decimalSeperator + "0+\b/"

If I try using a single backslash instead, the code does not compile due to issues with escaping characters:

"/\" + decimalSeperator + "0+\b/";
  • Error TS1005: ',' expected.
  • Error TS1127: Invalid character.
  • Error TS1002: Unterminated string literal.

I am unsure if this is a bug with Typescript or if I am approaching this problem incorrectly. Any insights would be appreciated.

Thank you.

Answer №1

It appears that the double backslash characters are not properly escaped in the compiled JavaScript code

This design choice was made intentionally. The compile time JavaScript closely resembles TypeScript before compilation. In this case, "\\" will compile to "\\". However, during runtime, "\\" will be interpreted as \, representing a single back slash.

console.log("\\"); // prints "\"

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