Regular Expressions 101

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/
^(.*)(-)(\d{1})(.[^.]+)$
/
gm
^ asserts position at start of a line
1st Capturing Group
(.*)
.
matches any character (except for line terminators)
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
2nd Capturing Group
(-)
- matches the character - with index 4510 (2D16 or 558) literally (case sensitive)
3rd Capturing Group
(\d{1})
\d
matches a digit (equivalent to [0-9])
{1} matches the previous token exactly one time (meaningless quantifier)
4th Capturing Group
(.[^.]+)
. matches any character (except for line terminators)
Match a single character not present in the list below
[^.]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
. matches the character . with index 4610 (2E16 or 568) literally (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

Substitution

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Generated Code

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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