const regex = /(?:
#start by finding the initial position of the table start, in order to store the match position for \G
TABLE\n\K|
#after we've found the table head, continue matching using this position. make sure we arent at the beginning of the string
\G(?<!^)
)
#capture the data we're interested in
(?:
#make sure there is no 'END' in the string
(?!END)
#match everything until the line ending
.
)*
#consume the newline at the end of the string
\n/g;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(?:
#start by finding the initial position of the table start, in order to store the match position for \\G
TABLE\\n\\K|
#after we\'ve found the table head, continue matching using this position. make sure we arent at the beginning of the string
\\G(?<!^)
)
#capture the data we\'re interested in
(?:
#make sure there is no \'END\' in the string
(?!END)
#match everything until the line ending
.
)*
#consume the newline at the end of the string
\\n', 'g')
const str = ``;
const subst = `%\0`;
// The substituted value will be contained in the result variable
const result = str.replace(regex, subst);
console.log('Substitution result: ', result);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions