Ruby String Scanner

Advancing the scan pointer.

Ruby string scanner.

Advances the scan pointer if advance pointer p otherwise not. 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. Scans the string until the pattern is matched.

Advances the scan pointer if advance pointer p otherwise not. 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. You can look ahead in the string without actually scanning.

Usually immediately after it. You can access the most recent match. This method does affect the match register. There are other methods besides the plain scanners.

In other words your program will be able to tell. This method does affect the match register. Think about an email address with a ruby regex you can define what a valid email address looks like. 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.

Given the string test string here are the pertinent scan pointer positions.