Regular Expressions 101

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/
^([A-z])(?: = )(\d|[A-z])$
/
gm
^ asserts position at start of a line
1st Capturing Group
([A-z])
Match a single character present in the list below
[A-z]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
A-z matches a single character in the range between A (index 65) and z (index 122) (case sensitive)
Non-capturing group
(?: = )
matches the character literally (case sensitive)
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
= matches the character = literally (case sensitive)
matches the character literally (case sensitive)
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
2nd Capturing Group
(\d|[A-z])
1st Alternative
\d
\d
matches a digit (equivalent to [0-9])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
2nd Alternative
[A-z]
Match a single character present in the list below
[A-z]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
A-z matches a single character in the range between A (index 65) and z (index 122) (case sensitive)
$ asserts position at the end of a line
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String

Regex Debugger

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