regex101: PCRE (Legacy) Match Workspace

Pro

1st Alternative(?=\#)(?:\#.*$)

Positive Lookahead(?=\#)

\#the literal # (35₁₀ / 43₈ / 23₁₆)

Non-Capturing Group(?:\#.*$)

\#the literal # (35₁₀ / 43₈ / 23₁₆)

.*any character (except for line terminators), repeated any number of times

$end of line

2nd Alternative(?!\#)\s*(?P<production>(?:[^\'\"\|\#]+|\'.*?\'|".*?")+)

Negative Lookahead(?!\#)

\#the literal # (35₁₀ / 43₈ / 23₁₆)

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

Group production(?P<production>(?:[^\'\"\|\#]+|\'.*?\'|".*?")+)

Non-Capturing Group(?:[^\'\"\|\#]+|\'.*?\'|".*?")+

+repeats the group contents below at least once:

1st Alternative[^\'\"\|\#]+

Negated Character Class[^\'\"\|\#]+

+matches at least one character outside the set below:

\'the literal ' (39₁₀ / 47₈ / 27₁₆)

\"the literal " (34₁₀ / 42₈ / 22₁₆)

\|the literal | (124₁₀ / 174₈ / 7C₁₆)

\#the literal # (35₁₀ / 43₈ / 23₁₆)

2nd Alternative\'.*?\'

\'the literal ' (39₁₀ / 47₈ / 27₁₆)

.*?any character (except for line terminators), repeated any number of times

\'the literal ' (39₁₀ / 47₈ / 27₁₆)

3rd Alternative".*?"

"the literal " (34₁₀ / 42₈ / 22₁₆)

.*?any character (except for line terminators), repeated any number of times

"the literal " (34₁₀ / 42₈ / 22₁₆)

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

25 tokens

Regular Expression

(?=\#)(?:\#.*$)|(?!\#)\s*(?P<production>(?:[^\'\"\|\#]+|\'.*?\'|".*?")+)

<int> ::= <int_var> | <int_const> # comment
        | <arith_prefix><int_var_const>
        | '(' <int_var_const> <arith_ops> <int_var_const> ')'
        | <int_arith_ops_protected>'('<int_var_const>','<int_var_const>')'
        | 'min('<int_var_const>', '<int_var_const>')'
        | 'max('<int_var_const>', '<int_var_const>')'
        | 'abs('<int_var_const>')'

Substitution

<int> ::= <int_var> | <int_const> # comment
        | <arith_prefix><int_var_const>
        | '(' <int_var_const> <arith_ops> <int_var_const> ')'
        | <int_arith_ops_protected>'('<int_var_const>','<int_var_const>')'
        | 'min('<int_var_const>', '<int_var_const>')'
        | 'max('<int_var_const>', '<int_var_const>')'
        | 'abs('<int_var_const>')'