Computing - Regular Expressions

Created: January 11, 2021 | Read markdown | About these notes | View in context | Study these flashcards |

PHOTO REGEX AB What regular expression is this?
000d4b8a31784fe1889e4b8788840748
\[ab\]
![PHOTO REGEX A B](regex-a-or-b.png) What regular expression is this?
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\[a \vert b\]

PHOTO REGEX A+ What regular expression is this?
ad37b6e42b724e1cbc79c70ae49a0c1e
\[a+\]

PHOTO REGEX A* What regular expression is this?
c024436536b544c7a5cba518356e3b96
\[a*\]

Visualise the finite state machine for $ab$?
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PHOTO REGEX AB

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

Visualise the finite state machine for $a+$?
2c2adea5713946eaac8cd6d757a75408

PHOTO REGEX A+

Visualise the finite state machine for $a*$?
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PHOTO REGEX A*

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