77 lines
1.9 KiB
JavaScript
77 lines
1.9 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2021 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var validate = require( './validate.js' );
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// VARIABLES //
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var REGEXP_STRING = '[-+]{0,1}[0-9]*\\.[0-9]+';
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// MAIN //
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/**
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* Returns a regular expression to match a decimal number.
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*
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* @param {Options} [options] - function options
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* @param {string} [options.flags=''] - regular expression flags
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* @param {boolean} [options.capture=false] - boolean indicating whether to create a capture group for the match
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* @throws {TypeError} options argument must be an object
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* @throws {TypeError} must provide valid options
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* @returns {RegExp} regular expression
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*
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* @example
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* var RE_DECIMAL_NUMBER = reDecimalNumber();
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*
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* var bool = RE_DECIMAL_NUMBER.test( 'beep 1.0 boop' );
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* // returns true
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*
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* @example
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* var RE_DECIMAL_NUMBER = reDecimalNumber({
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* 'flags': 'gm'
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* });
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* var bool = RE_DECIMAL_NUMBER.test( 'beep 1.0 boop' );
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* // returns true
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*/
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function reDecimalNumber( options ) {
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var opts;
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var err;
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if ( arguments.length > 0 ) {
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opts = {};
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err = validate( opts, options );
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if ( err ) {
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throw err;
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}
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if ( opts.capture ) {
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return new RegExp( '('+REGEXP_STRING+')', opts.flags );
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}
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return new RegExp( REGEXP_STRING, opts.flags );
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}
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return /[-+]{0,1}[0-9]*\.[0-9]+/;
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}
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// EXPORTS //
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module.exports = reDecimalNumber;
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