Ruby String Scanner

The point of scanning is to move forward a bit at a time so matches are sought after the scan pointer.

Ruby string scanner. You can look ahead in the string without actually scanning. Scans the string until the pattern is matched. Ruby regular expressions ruby regex for short help you find specific patterns inside strings with the intent of extracting data for further processing two common use cases for regular expressions include validation parsing. Given the string test string here are the pertinent scan pointer positions.

Advances the scan pointer if advance pointer p otherwise not. Returns the matched string if return string p is true otherwise returns the number of bytes advanced. Scan is a stringscanner class method which tries to match with pattern at the current position. Scanning a string means remembering the position of a scan pointer which is just an index.

In other words your program will be able to tell. You can modify the string being scanned reset or terminate the scanner find out or change the position of the scan pointer skip ahead and so on. Advances the scan pointer if advance pointer p otherwise not. You can access the most recent match.

This method does affect the match register. Advancing the scan pointer. Returns the matched string if return string p is true otherwise returns the number of bytes advanced. Scans the string until the pattern is matched.

This method does affect the match register.