Ruby String Scanner

This method does affect the match register.

Ruby string scanner. 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. Scans the string until the pattern is matched. Returns the matched string if return string p is true otherwise returns the number of bytes advanced.

Advancing the scan pointer. You can look ahead in the string without actually scanning. Think about an email address with a ruby regex you can define what a valid email address looks like. The point of scanning is to move forward a bit at a time so matches are sought after the scan pointer.

This method does affect the match register. 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. There are other methods besides the plain scanners. Given the string test string here are the pertinent scan pointer positions.

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. Returns the matched string if return string p is true otherwise returns the number of bytes advanced. You can access the most recent match. Advances the scan pointer if advance pointer p otherwise not.

In other words your program will be able to tell.