Regex Quick Syntax Reference by Zsolt Nagy

Author:Zsolt Nagy
Language: eng
Format: epub, azw3
ISBN: 9781484238769
Publisher: Apress

Match at Least Once

In BRE, we have to use the * to represent the + repeat modifier. a+ becomes aa*. In other words, matching an a character and at least zero more a characters is equivalent to matching at least one a character.

In EMACS and VIM, you have to escape the + operator. a+ becomes a\+. In all other dialects, we use the following:a+ to denote matching the a character at least once

[ab]+ to denote matching the a or the b character at least once

(ab)+ to denote matching the ab sequence at least once

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