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I'm loading a .obj file that has lines like
vn 8.67548e-017 1 -1.55211e-016
for the vertex normals. How can I detect them and bring them to double notation?
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$ means "Match the end of the string" (the position after the last character in the string). Both are called anchors and ensure that the entire string is matched instead of just a substring.
The regex [0-9] matches single-digit numbers 0 to 9. [1-9][0-9] matches double-digit numbers 10 to 99. That's the easy part. Matching the three-digit numbers is a little more complicated, since we need to exclude numbers 256 through 999.
\d (digit) matches any single digit (same as [0-9] ). The uppercase counterpart \D (non-digit) matches any single character that is not a digit (same as [^0-9] ). \s (space) matches any single whitespace (same as [ \t\n\r\f] , blank, tab, newline, carriage-return and form-feed).
\d is a digit (a character in the range [0-9] ), and + means one or more times. Thus, \d+ means match one or more digits. For example, the string "42" is matched by the pattern \d+ .
You can identify the scientific values using: -?\d*\.?\d+e[+-]?\d+ regex.
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