regex101: PCRE (Legacy) Substitution Workspace

Pro

(?sx)applies the following effective flags to the remainder of the pattern: sx

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

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

Comment: Free-Spacing

Definition Group(?(DEFINE) # Define a few subroutines (?<double>“(?:(?!&[lr]squo;).)*”) # full set of doubles (no quotes inside) (?<single>‘(?:(?!&[lr]dquo;).)*’) # full set of singles (no quotes inside) (?<notquotes>(?:(?!&[lr][sd]quo;).)*) # chars that are not quotes )

Comment: Define a few subroutines

Group double(?<double>“(?:(?!&[lr]squo;).)*”)

“the literal text “ (case sensitive)

Non-Capturing Group(?:(?!&[lr]squo;).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!&[lr]squo;)

&the literal & (38₁₀ / 46₈ / 26₁₆)

Character Class[lr]

lthe literal l (108₁₀ / 154₈ / 6C₁₆) (case sensitive)

rthe literal r (114₁₀ / 162₈ / 72₁₆) (case sensitive)

squo;the literal text squo; (case sensitive)

.any character

”the literal text ” (case sensitive)

Comment: full set of doubles (no quotes inside)

Group single(?<single>‘(?:(?!&[lr]dquo;).)*’)

‘the literal text ‘ (case sensitive)

Non-Capturing Group(?:(?!&[lr]dquo;).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!&[lr]dquo;)

&the literal & (38₁₀ / 46₈ / 26₁₆)

Character Class[lr]

lthe literal l (108₁₀ / 154₈ / 6C₁₆) (case sensitive)

rthe literal r (114₁₀ / 162₈ / 72₁₆) (case sensitive)

dquo;the literal text dquo; (case sensitive)

.any character

’the literal text ’ (case sensitive)

Comment: full set of singles (no quotes inside)

Group notquotes(?<notquotes>(?:(?!&[lr][sd]quo;).)*)

Non-Capturing Group(?:(?!&[lr][sd]quo;).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!&[lr][sd]quo;)

&the literal & (38₁₀ / 46₈ / 26₁₆)

Character Class[lr]

lthe literal l (108₁₀ / 154₈ / 6C₁₆) (case sensitive)

rthe literal r (114₁₀ / 162₈ / 72₁₆) (case sensitive)

Character Class[sd]

sthe literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

dthe literal d (100₁₀ / 144₈ / 64₁₆) (case sensitive)

quo;the literal text quo; (case sensitive)

.any character

Comment: chars that are not quotes

Comment: end DEFINE

^start of string

Comment: Start of string

Non-Capturing Group(?: # Start non-capture group (?&notquotes) # Any non-quote chars &l(?<type>[sd])quo; # Opening quote, capture single or double type # any full singles, doubles, not quotes or recursion (?:(?&single)|(?&double)|(?&notquotes)|(?R))* &r\k<type>quo; # Closing quote of the correct type )*+

*+repeats the group contents below any number of times:

Comment: Start non-capture group

(?&notquotes)calls group notquotes as a subroutine

Comment: Any non-quote chars

&lthe literal text &l (case sensitive)

Group type(?<type>[sd])

Character Class[sd]

sthe literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

dthe literal d (100₁₀ / 144₈ / 64₁₆) (case sensitive)

quo; the literal text quo; (case sensitive)

Comment: Opening quote, capture single or double type

Comment: any full singles, doubles, not quotes or recursion

Non-Capturing Group(?:(?&single)|(?&double)|(?&notquotes)|(?R))*

*repeats the group contents below any number of times:

1st Alternative(?&single)

(?&single)calls group single as a subroutine

2nd Alternative(?&double)

(?&double)calls group double as a subroutine

3rd Alternative(?&notquotes)

(?&notquotes)calls group notquotes as a subroutine

4th Alternative(?R)

(?R)recurses into the entire pattern

&rthe literal text &r (case sensitive)

\k<type>the text saved by group type

quo; the literal text quo; (case sensitive)

Comment: Closing quote of the correct type

Comment: Repeat non-capture group

(?&notquotes)calls group notquotes as a subroutine

\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match

&the literal text &

Character Class[lr]

lthe literal l (108₁₀ / 154₈ / 6C₁₆) (case sensitive)

rthe literal r (114₁₀ / 162₈ / 72₁₆) (case sensitive)

Character Class[sd]

sthe literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

dthe literal d (100₁₀ / 144₈ / 64₁₆) (case sensitive)

quo; the literal text quo; (case sensitive)

Comment: unmatched quote

25 tokens

Regular Expression

(?sx)                  # Free-Spacing
(?(DEFINE)            # Define a few subroutines
   (?<double>&ldquo;(?:(?!&[lr]squo;).)*&rdquo;)  # full set of doubles (no quotes inside)
   (?<single>&lsquo;(?:(?!&[lr]dquo;).)*&rsquo;)  # full set of singles (no quotes inside)
   (?<notquotes>(?:(?!&[lr][sd]quo;).)*)          # chars that are not quotes
)                     # end DEFINE

^                       # Start of string
(?:                     # Start non-capture group
   (?&notquotes)        # Any non-quote chars
   &l(?<type>[sd])quo;  # Opening quote, capture single or double type
   # any full singles, doubles, not quotes or recursion
   (?:(?&single)|(?&double)|(?&notquotes)|(?R))*
   &r\k<type>quo;       # Closing quote of the correct type
)*+                   # Repeat non-capture group
(?&notquotes)
\K
&[lr][sd]quo;  # unmatched quote

Unit Tests

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