Regular Expressions 101

Negative Lookahead(?!^name=)

^start of line

name=the literal text name= (case sensitive)

Group 1("|')?

?repeats the group contents below at most once:

1st Alternative"

"the literal " (34₁₀ / 42₈ / 22₁₆)

2nd Alternative'

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Group first_name(?<first_name>([A-z]|\s)*)

Group 3([A-z]|\s)*

*repeats the group contents below any number of times:

1st Alternative[A-z]

Character Class[A-z]

A-zone character from A (65₁₀) to z (122₁₀) (case sensitive)

2nd Alternative\s

\sany whitespace character

Group 4("|')*

*repeats the group contents below any number of times:

1st Alternative"

"the literal " (34₁₀ / 42₈ / 22₁₆)

2nd Alternative'

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Group 5(\,{0,1})

\,{0,1}optionally matches the literal , (44₁₀ / 54₈ / 2C₁₆)

Group 6("|')*

*repeats the group contents below any number of times:

1st Alternative"

"the literal " (34₁₀ / 42₈ / 22₁₆)

2nd Alternative'

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Group second_name(?<second_name>(([A-z]|\s)*))

Group 8(([A-z]|\s)*)

Group 9([A-z]|\s)*

*repeats the group contents below any number of times:

1st Alternative[A-z]

Character Class[A-z]

A-zone character from A (65₁₀) to z (122₁₀) (case sensitive)

2nd Alternative\s

\sany whitespace character

Group 10("|')*

*repeats the group contents below any number of times:

1st Alternative"

"the literal " (34₁₀ / 42₈ / 22₁₆)

2nd Alternative'

'the literal ' (39₁₀ / 47₈ / 27₁₆)

$end of line

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

(?!^name=)("|')?(?<first_name>([A-z]|\s)*)("|')*(\,{0,1})("|')*(?<second_name>(([A-z]|\s)*))("|')*$

New

name="Peter Nash","Costa"
name='Peter Nash',"Costa"
name="Peter Nash"
name=Peter,"Costa"
name=Peter,Costa
name=Peter

Regular Expression

Substitution