Computing - Regular Expressions

Created: January 11, 2021

PHOTO REGEX AB What regular expression is this?
\[ab\]
![PHOTO REGEX A B](/assets/img/attachments/regex-a-or-b.png) What regular expression is this?
\[a|b\]

PHOTO REGEX A+ What regular expression is this?
\[a+\]

PHOTO REGEX A* What regular expression is this?
\[a*\]

Visualise the finite state machine for $ab$?

PHOTO REGEX AB

Visualise the finite state machine for $a \vert b$?
![PHOTO REGEX A B](/assets/img/attachments/regex-a-or-b.png)

Visualise the finite state machine for $a+$?

PHOTO REGEX A+

Visualise the finite state machine for $a*$?

PHOTO REGEX A*

What is the precedence for regular expressions?
  • ()
  • *
  • +
  • ?
  • |


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