5EEE EEEEE$EEEERegexpE ExpressionEAnchorEBaseEBeginningOfLineE EndOfLineEBeginningOfStringE EndOfStringEEndOfStringOrBeforeEndOfLineE WordBoundaryENonWordBoundaryE MatchStartEBOLEEOLEBOSEEOSEEOSobEOL% ,W|0[+Po.E\