Add RegExp source escaping tests for remaining LineTerminators (CR, LS, PS)

test/built-ins/RegExp/prototype/source/value-carriage-return.js

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+// Copyright (C) 2026 dmvjs. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-get-regexp.prototype.source
+description: >
+  Return value can be used to create an equivalent RegExp when the
+  [[OriginalSource]] internal slot contains a carriage return (U+000D)
+info: |
+  [...]
+  5. Let src be R.[[OriginalSource]].
+  6. Let flags be R.[[OriginalFlags]].
+  7. Return EscapeRegExpPattern(src, flags).
+
+  21.2.3.2.4 Runtime Semantics: EscapeRegExpPattern
+
+  [...] the internal procedure that would result from evaluating S as a
+  Pattern[~U] (Pattern[+U] if F contains "u") must behave identically to the
+  internal procedure given by the constructed object's [[RegExpMatcher]]
+  internal slot.
+---*/
+
+var re = eval('/' + new RegExp('\r').source + '/');
+
+assert.sameValue(re.test('\r'), true, 'input: "\\r"');
+assert.sameValue(re.test('_\r_'), true, 'input: "_\\r_"');
+assert.sameValue(re.test('\\r'), false, 'input: "\\\\r"');
+assert.sameValue(re.test('\n'), false, 'input: "\\n"');
+assert.sameValue(re.test('r'), false, 'input: "r"');

test/built-ins/RegExp/prototype/source/value-line-separator.js

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+// Copyright (C) 2026 dmvjs. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-get-regexp.prototype.source
+description: >
+  Return value can be used to create an equivalent RegExp when the
+  [[OriginalSource]] internal slot contains a line separator (U+2028)
+info: |
+  [...]
+  5. Let src be R.[[OriginalSource]].
+  6. Let flags be R.[[OriginalFlags]].
+  7. Return EscapeRegExpPattern(src, flags).
+
+  21.2.3.2.4 Runtime Semantics: EscapeRegExpPattern
+
+  [...] the internal procedure that would result from evaluating S as a
+  Pattern[~U] (Pattern[+U] if F contains "u") must behave identically to the
+  internal procedure given by the constructed object's [[RegExpMatcher]]
+  internal slot.
+---*/
+
+var re = eval('/' + new RegExp('\u2028').source + '/');
+
+assert.sameValue(re.test('\u2028'), true, 'input: "\\u2028"');
+assert.sameValue(re.test('_\u2028_'), true, 'input: "_\\u2028_"');
+assert.sameValue(re.test('\\u2028'), false, 'input: "\\\\u2028"');
+assert.sameValue(re.test('\u2029'), false, 'input: "\\u2029"');
+assert.sameValue(re.test('\n'), false, 'input: "\\n"');

test/built-ins/RegExp/prototype/source/value-paragraph-separator.js

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+// Copyright (C) 2026 dmvjs. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-get-regexp.prototype.source
+description: >
+  Return value can be used to create an equivalent RegExp when the
+  [[OriginalSource]] internal slot contains a paragraph separator (U+2029)
+info: |
+  [...]
+  5. Let src be R.[[OriginalSource]].
+  6. Let flags be R.[[OriginalFlags]].
+  7. Return EscapeRegExpPattern(src, flags).
+
+  21.2.3.2.4 Runtime Semantics: EscapeRegExpPattern
+
+  [...] the internal procedure that would result from evaluating S as a
+  Pattern[~U] (Pattern[+U] if F contains "u") must behave identically to the
+  internal procedure given by the constructed object's [[RegExpMatcher]]
+  internal slot.
+---*/
+
+var re = eval('/' + new RegExp('\u2029').source + '/');
+
+assert.sameValue(re.test('\u2029'), true, 'input: "\\u2029"');
+assert.sameValue(re.test('_\u2029_'), true, 'input: "_\\u2029_"');
+assert.sameValue(re.test('\\u2029'), false, 'input: "\\\\u2029"');
+assert.sameValue(re.test('\u2028'), false, 'input: "\\u2028"');
+assert.sameValue(re.test('\n'), false, 'input: "\\n"');