| // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| /// Regex that matches a version number at the beginning of a string. |
| final startVersion = RegExp(r'^' // Start at beginning. |
| r'(\d+).(\d+).(\d+)' // Version number. |
| r'(-([0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*))?' // Pre-release. |
| r'(\+([0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*))?'); // Build. |
| |
| /// Like [startVersion] but matches the entire string. |
| final completeVersion = RegExp('${startVersion.pattern}\$'); |
| |
| /// Parses a comparison operator ("<", ">", "<=", or ">=") at the beginning of |
| /// a string. |
| final startComparison = RegExp(r"^[<>]=?"); |
| |
| /// The "compatible with" operator. |
| const compatibleWithChar = "^"; |
