Regular Expressions 101

Pro

Definition Group(?(DEFINE) (?<blanks>[[:blank:]]+) (?<var>"?[[:alnum:]_]+"?) (?<csvar>("?[[:alnum:]_]+"?,?)+) )

Group blanks(?<blanks>[[:blank:]]+)

Character Class[[:blank:]]+

+matches at least one character from the set below:

[:blank:]a whitespace character, excluding line breaks [ \t]

Group var(?<var>"?[[:alnum:]_]+"?)

"?optionally matches the literal " (34₁₀ / 42₈ / 22₁₆)

Character Class[[:alnum:]_]+

+matches at least one character from the set below:

[:alnum:]an alphanumeric character [a-zA-Z0-9]

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

"?optionally matches the literal " (34₁₀ / 42₈ / 22₁₆)

Group csvar(?<csvar>("?[[:alnum:]_]+"?,?)+)

Group 4("?[[:alnum:]_]+"?,?)+

+repeats the group contents below at least once:

"?optionally matches the literal " (34₁₀ / 42₈ / 22₁₆)

Character Class[[:alnum:]_]+

+matches at least one character from the set below:

[:alnum:]an alphanumeric character [a-zA-Z0-9]

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

"?optionally matches the literal " (34₁₀ / 42₈ / 22₁₆)

,?optionally matches the literal , (44₁₀ / 54₈ / 2C₁₆)

^start of line

(?&blanks)calls group blanks as a subroutine

Group 5((?&var))

(?&var)calls group var as a subroutine

(?&blanks)calls group blanks as a subroutine

Group 6((?&var))

(?&var)calls group var as a subroutine

(?&blanks)calls group blanks as a subroutine

Group 7((?&csvar))

(?&csvar)calls group csvar as a subroutine

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

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

(?(DEFINE)
(?<blanks>[[:blank:]]+)
(?<var>"?[[:alnum:]_]+"?)
(?<csvar>("?[[:alnum:]_]+"?,?)+)
)
^
(?&blanks)((?&var))
(?&blanks)((?&var))
(?&blanks)((?&csvar))

New

 foo 	foo_123bar		foo,bar,bazz
	foo2 	foo_456bar		foo2,bar2

Substitution

 foo 	foo_123bar		foo,bar,bazz
	foo2 	foo_456bar		foo2,bar2