Regex in rails

Ruby match word in string

text = "A regular expression is a sequence of characters that define a search pattern."

puts 'Found "A" at the beginning of the string.' if text.match(/^A/)
puts 'Found "O" at the beginning of the string.' if text.match(/^O/)

puts 'Found the string "character".' if text.match(/character/)
puts 'Found the word "character".' if text.match(/character\b/)

Source: ruby-for-beginners.rubymonstas.org

Rails where regex

@max_draw = Drawing.where("drawing_number ~* ?", '^A\d{4}$')

Source: stackoverflow.com

Regex in rails

Model.where("column ~* ?", ''^A\d{4}$'')

^ - string start anchor
A - literal "A"
\d+ - one or more digits (0-9)
\d{4} - exactly four digits
$ - string end anchor

Basically, the regex reads "the string should start with an A, followed by 
four digits and then the string should end". The final query line is:

@max_draw = Drawing.where("drawing_number ~* ?", '^A\d{4}$')

Source: stackoverflow.com

Similar codes

11 votes200 views6 answers
C malloc
C
0 vote254 views1 answer
File "rs_to_open3d.py", line 19, in <module> point cloud = Point Cloud() NameError: name 'PointCloud' is not defined
C
2 votes170 views1 answer
Hashmap c
C
0 vote181 views2 answers
Les fichiers en c
C
0 vote223 views1 answer
Run steam as root
C
0 vote184 views2 answers
Google cloud open port
C
0 vote244 views1 answer
Conditional compilation in c
C
0 vote182 views1 answer
Unconstrained box flutter
C
0 vote176 views1 answer
Symmetrical matrix in C
C
0 vote186 views1 answer
Data breach
C