^start of string
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]
Character Class[[:word:]_] [:word:]a word character [A-Za-z0-9_]
_the literal _ (9510 / 1378 / 5F16)
Character Class[[:word:][:digit:]_]* *matches any number of characters from the set below:
[:word:]a word character [A-Za-z0-9_]
[:digit:]a digit [0-9]
_the literal _ (9510 / 1378 / 5F16)
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]
.*any character (except for line terminators), repeated any number of times
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]
Character Class[[:word:]_] [:word:]a word character [A-Za-z0-9_]
_the literal _ (9510 / 1378 / 5F16)
Character Class[[:word:][:digit:]_]* *matches any number of characters from the set below:
[:word:]a word character [A-Za-z0-9_]
[:digit:]a digit [0-9]
_the literal _ (9510 / 1378 / 5F16)
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]
\(the literal ( (4010 / 508 / 2816)
.*any character (except for line terminators), repeated any number of times
\)the literal ) (4110 / 518 / 2916)
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]
$end of string, or before its final line terminator