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

Code Generator

Generated Code

Loading code sample...
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report.
For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php