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Where this fits
regex
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.
Matches any character except for line breaks if dotall is false.
*
Matches 0 or more of the preceding character.
+
Matches 1 or more of the preceding character.
?
Preceding character is optional. Matches 0 or 1 occurrence.
\d
Matches any single digit
\w
Matches any word character (alphanumeric & underscore).
[XYZ]
Matches any single character from the character class.
[XYZ]+
Matches one or more of any of the characters in the set.
&
Matches the end of the string.
^
Matches the beginning of a string.
[^a-z]
When inside of a character class ^ means NOT; in this case match anything that is NOT a lowercase
letter.