Regular Expressions 101

^start of line

Positive Lookahead(?=[^[:word:]]*Generated at)

Negated Character Class[^[:word:]]*

*matches any number of characters outside the set below:

[:word:]a word character [A-Za-z0-9_]

Generated atthe literal text Generated at (case sensitive)

Character Class[[:space:]]*

*matches any number of characters from the set below:

[:space:]a whitespace character, including a line break [ \t\r\n\v\f]

Negated Character Class[^[:space:]*]

[:space:]a whitespace character, including a line break [ \t\r\n\v\f]

*the literal * (42₁₀ / 52₈ / 2A₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(?=[^[:word:]]*Generated at)[[:space:]]*[^[:space:]*]

New

- * Generated at 2018-11-21
+ * Generated at 2018-11-23
+ * This line is important! Although it starts with a * 
+ * Generated at 2018-11-23
+ * This line should be important, but there it contains a "Generated at"...

Regular Expression

Substitution