Gulp: replace {BACK}...{/BACK} by nothing

gulptask-replace-back-front.js

/**
 * Put some code section in command before moving them
 *
 * @example
 * ```
 * let start = 1;
 * // {BACK}
 * let backendvar = 'red is dead';
 * // {/BACK}
 * let end = 1;
 * ```
 * will output
 * ```
 * let start = 1;
 * // // {BACK}
 * // let backendvar = 'red is dead';
 * // // {/BACK}
 * let end = 1;
 * ```
 */
import gulp from 'gulp';
import replace from 'gulp-replace';

return gulp.src('./src/*.js')
    .pipe($.replace(/\/\/\s*\{BACK\}(.|[\n])*BACK\}/ig, function(reg) {
      return reg.split('\n').join('\n// ');
    }))
    .pipe(gulp.dest('./dist'));