ts-regex-builder/dist/esm/builders.mjs

Maintainable regular expressions for TypeScript and JavaScript.

import { encode } from "./encoder.mjs";
export function buildRegExp(sequence, flags) {
  const pattern = encode(sequence).pattern;
  ensureUnicodeFlagIfNeeded(pattern, flags);
  const flagsString = encodeFlags(flags ?? {});
  return new RegExp(pattern, flagsString);
}
export function buildPattern(sequence) {
  return encode(sequence).pattern;
}
function encodeFlags(flags) {
  let result = '';
  if (flags.global) result += 'g';
  if (flags.ignoreCase) result += 'i';
  if (flags.multiline) result += 'm';
  if (flags.hasIndices) result += 'd';
  if (flags.dotAll) result += 's';
  if (flags.sticky) result += 'y';
  if (flags.unicode) result += 'u';
  return result;
}
const unicodeModePatterns = /(?<!\\)(?:\\u|\\[pP])\{.+?\}/;
function ensureUnicodeFlagIfNeeded(pattern, flags) {
  if (flags?.unicode) {
    return;
  }
  const match = pattern.match(unicodeModePatterns);
  if (match) {
    throw new Error(`Pattern "${match?.[0]}" requires "unicode" flag to be set.`);
  }
}
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