regex101: PCRE (Legacy) Match Workspace

Positive Lookbehind(?<=^|;|<\?php\s|<\?\s)

1st Alternative^

^start of line

2nd Alternative;

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

3rd Alternative<\?php\s

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

phpthe literal text php (case insensitive)

\sany whitespace character

4th Alternative<\?\s

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

\sany whitespace character

Group 1(\s*?)

\s*?any whitespace character, repeated any number of times

Group 2(\h*define\s*\(\s*[\'"](\w*?)[\'"]\s*)

\h*any horizontal whitespace character, repeated any number of times

definethe literal text define (case insensitive)

\s*any whitespace character, repeated any number of times

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\s*any whitespace character, repeated any number of times

Character Class[\'"]

\'the literal ' (39₁₀ / 47₈ / 27₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

Group 3(\w*?)

\w*?any word character, repeated any number of times

Character Class[\'"]

\'the literal ' (39₁₀ / 47₈ / 27₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

\s*any whitespace character, repeated any number of times

Group 4(,\s*([\'"].*?[\'"]|.*?)\s*)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\s*any whitespace character, repeated any number of times

Group 5([\'"].*?[\'"]|.*?)

1st Alternative[\'"].*?[\'"]

Character Class[\'"]

\'the literal ' (39₁₀ / 47₈ / 27₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

.*?any character, repeated any number of times

Character Class[\'"]

\'the literal ' (39₁₀ / 47₈ / 27₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

2nd Alternative.*?

.*?any character, repeated any number of times

\s*any whitespace character, repeated any number of times

Group 6((?:,\s*(?:true|false)\s*)?\)\s*;)

Non-Capturing Group(?:,\s*(?:true|false)\s*)?

?repeats the group contents below at most once:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\s*any whitespace character, repeated any number of times

Non-Capturing Group(?:true|false)

1st Alternativetrue

truethe literal text true (case insensitive)

2nd Alternativefalse

falsethe literal text false (case insensitive)

\s*any whitespace character, repeated any number of times

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\s*any whitespace character, repeated any number of times

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

Global pattern flags

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

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

s modifier: single line. Allows a dot to match line terminators

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

Search reference

Regular Expression

(?<=^|;|<\?php\s|<\?\s)(\s*?)(\h*define\s*\(\s*[\'"](\w*?)[\'"]\s*)(,\s*([\'"].*?[\'"]|.*?)\s*)((?:,\s*(?:true|false)\s*)?\)\s*;)

Unit Tests

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