some more variables

src/compiler/compile/Component.ts

@@ -47,6 +47,8 @@ interface ComponentOptions {
 	preserveWhitespace?: boolean;
 }
 
+const regex_leading_directory_separator = /^[/\\]/;
+
 export default class Component {
 	stats: Stats;
 	warnings: Warning[];
@@ -136,7 +138,7 @@ export default class Component {
 			(typeof process !== 'undefined'
 				? compile_options.filename
 					.replace(process.cwd(), '')
-					.replace(/^[/\\]/, '')
+				.replace(regex_leading_directory_separator, '')
 				: compile_options.filename);
 		this.locate = getLocator(this.source, { offsetLine: 1 });
 

src/compiler/compile/css/Selector.ts

@@ -281,12 +281,14 @@ function apply_selector(blocks: Block[], node: Element, to_encapsulate: Array<{
 	return true;
 }
 
+const regex_backslash_and_following_character = /\\(.)/g;
+
 function block_might_apply_to_node(block: Block, node: Element): BlockAppliesToNode {
 	let i = block.selectors.length;
 
 	while (i--) {
 		const selector = block.selectors[i];
-		const name = typeof selector.name === 'string' && selector.name.replace(/\\(.)/g, '$1');
+		const name = typeof selector.name === 'string' && selector.name.replace(regex_backslash_and_following_character, '$1');
 
 		if (selector.type === 'PseudoClassSelector' && (name === 'host' || name === 'root')) {
 			return BlockAppliesToNode.NotPossible;

src/compiler/compile/css/Stylesheet.ts

@@ -10,8 +10,10 @@ import compiler_warnings from '../compiler_warnings';
 import { extract_ignores_above_position } from '../../utils/extract_svelte_ignore';
 import { push_array } from '../../utils/push_array';
 
+const regex_css_browser_prefix = /^-((webkit)|(moz)|(o)|(ms))-/;
+
 function remove_css_prefix(name: string): string {
-	return name.replace(/^-((webkit)|(moz)|(o)|(ms))-/, '');
+	return name.replace(regex_css_browser_prefix, '');
 }
 
 const is_keyframes_node = (node: CssNode) =>

src/compiler/compile/nodes/Element.ts

@@ -988,7 +988,7 @@ export default class Element extends Node {
 			if (attribute && !attribute.is_true) {
 				attribute.chunks.forEach((chunk, index) => {
 					if (chunk.type === 'Text') {
-						let data = chunk.data.replace(/[\s\n\t]+/g, ' ');
+						let data = chunk.data.replace(regex_any_repeated_whitespace, ' ');
 						if (index === 0) {
 							data = data.trimLeft();
 						} else if (index === attribute.chunks.length - 1) {
@@ -1002,12 +1002,16 @@ export default class Element extends Node {
 	}
 }
 
+const regex_any_repeated_whitespace = /[\s\n\t]+/g;
+
+const regex_starts_with_vovel = /^[aeiou]/;
+
 function should_have_attribute(
 	node,
 	attributes: string[],
 	name = node.name
 ) {
-	const article = /^[aeiou]/.test(attributes[0]) ? 'an' : 'a';
+	const article = regex_starts_with_vovel.test(attributes[0]) ? 'an' : 'a';
 	const sequence = attributes.length > 1 ?
 		attributes.slice(0, -1).join(', ') + ` or ${attributes[attributes.length - 1]}` :
 		attributes[0];

src/compiler/compile/render_dom/wrappers/Element/Attribute.ts

@@ -45,6 +45,8 @@ export class BaseAttributeWrapper {
 	render(_block: Block) {}
 }
 
+const regex_minus_sign = /-/;
+
 export default class AttributeWrapper extends BaseAttributeWrapper {
 	node: Attribute;
 	parent: ElementWrapper;
@@ -115,7 +117,7 @@ export default class AttributeWrapper extends BaseAttributeWrapper {
 		// xlink is a special case... we could maybe extend this to generic
 		// namespaced attributes but I'm not sure that's applicable in
 		// HTML5?
-		const method = /-/.test(element.node.name)
+		const method = regex_minus_sign.test(element.node.name)
 			? '@set_custom_element_data'
 			: name.slice(0, 6) === 'xlink:'
 				? '@xlink_attr'

src/compiler/compile/render_dom/wrappers/Element/StyleAttribute.ts

@@ -69,6 +69,8 @@ export default class StyleAttributeWrapper extends AttributeWrapper {
 	}
 }
 
+const regex_style_prop_key = /^\s*([\w-]+):\s*/;
+
 function optimize_style(value: Array<Text | Expression>) {
 	const props: StyleProp[] = [];
 	let chunks = value.slice();
@@ -78,7 +80,7 @@ function optimize_style(value: Array<Text | Expression>) {
 
 		if (chunk.type !== 'Text') return null;
 
-		const key_match = /^\s*([\w-]+):\s*/.exec(chunk.data);
+		const key_match = regex_style_prop_key.exec(chunk.data);
 		if (!key_match) return null;
 
 		const key = key_match[1];