Regular Expressions 101

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/
\!\[.+?\]\((.+?)\)
/
gm
\! matches the character ! with index 3310 (2116 or 418) literally (case sensitive)
\[ matches the character [ with index 9110 (5B16 or 1338) literally (case sensitive)
.
matches any character (except for line terminators)
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
\( matches the character ( with index 4010 (2816 or 508) literally (case sensitive)
1st Capturing Group
(.+?)
.
matches any character (except for line terminators)
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
\) matches the character ) with index 4110 (2916 or 518) literally (case sensitive)
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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