Appendix B: Parsing a URI Reference with a Regular Expression

The following regular expression can parse a URI reference into its components:

^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?
 12            3  4          5       6  7        8 9

Component Mapping:

• $1 = scheme:
• $2 = scheme
• $3 = //authority
• $4 = authority
• $5 = path
• $6 = ?query
• $7 = query
• $8 = #fragment
• $9 = fragment

Example: http://www.ics.uci.edu/pub/ietf/uri/#Related

• scheme = http
• authority = www.ics.uci.edu
• path = /pub/ietf/uri/
• query = (undefined)
• fragment = Related