How to Copy a number from a string

Question

I want to copy a section of a string, which lies between two fixed string sections. How to do it?

For example if the string is "...\abcd124\145@cvdf\efgh...". How to tell Mathematica to copy the number between abcd124\ and @cvdf, which is 145.

Here "..." means that the string continues on both sides, but may be different for each case.

thanks

Answer 1

1. Split the string on the backslash \\
2. Find the part that ends with @cvdf
3. Take the digits and convert to an expression, then use FromDigits to get the final number.

str = "...\\abcd124\\145@cvdf\\efgh...";

FromDigits@
 ToExpression[
  StringCases[
   SelectFirst[StringSplit[str, "\\"], StringEndsQ[#, "@cvdf"] &], 
   DigitCharacter]]

Answer 2

To find a numeric value between the strings "abcd124\" and "@cvdf", we can use a named pattern and StringCases. Assume the pattern happens only once within string.

string = "\\abcd124\\145@cvdf\\efgh";
ToExpression[First@StringCases[string, "abcd124\\"~~x:DigitCharacter..~~"@cvdf"->x]]

Get the same result using RegularExpression with this expression:

ToExpression[First@StringCases[string, RegularExpression["abcd124\\\\(\\d+)@cvdf"]->"$1"]]