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Let us try to find combinations of any characters with `y`.\n\nSeems like there are two matches:\n\n---\n/`.y`/\n\njava \\ `py`thon ru`by`1.9 javascript c#\n\n---\n\nCombining special and ordinary characters, we need to remember that special characters have particular behavior. Notice the example below, where we have written the characters `1.9`. 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{.mantine-hidden-from-lg {display: none !important;}}@media (max-width: 87.99375em) {.mantine-visible-from-xl {display: none !important;}}@media (min-width: 88em) {.mantine-hidden-from-xl {display: none !important;}}</style><div style="--container-size:var(--container-size-lg);margin-top:var(--mantine-spacing-xl);height:100%" class="m_7485cace mantine-Container-root" data-size="lg" data-strategy="block"><style data-mantine-styles="inline">.__m__-_R_eub_{margin-bottom:var(--mantine-spacing-xs);}@media(min-width: 36em){.__m__-_R_eub_{margin-bottom:var(--mantine-spacing-xs);}}</style><div style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:space-between;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root __m__-_R_eub_"><style data-mantine-styles="inline">.__m__-_R_deub_{width:100%;}@media(min-width: 62em){.__m__-_R_deub_{width:66%;}}</style><div class="__m__-_R_deub_"><div style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><h1 style="--title-fw:var(--mantine-h1-font-weight);--title-lh:var(--mantine-h1-line-height);--title-fz:var(--mantine-h1-font-size)" class="m_8a5d1357 mantine-Title-root" data-order="1">Course “Regular Expressions (Regexp)”</h1></div></div></div><style data-mantine-styles="inline">.__m__-_R_1iub_{width:100%;}@media(min-width: 62em){.__m__-_R_1iub_{width:66%;}}</style><div style="margin-bottom:var(--mantine-spacing-xl)" class="__m__-_R_1iub_"><div style="margin-bottom:var(--mantine-spacing-lg)" class=""></div><div style="margin-top:var(--mantine-spacing-lg)" class="mantine-hidden-from-md"><div style="--stack-gap:var(--mantine-spacing-xs);--stack-align:stretch;--stack-justify:flex-start" class="m_6d731127 mantine-Stack-root"><a 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mantine-Grid-inner"><style data-mantine-styles="inline">.__m__-_R_dmiub_{--col-flex-grow:auto;--col-flex-basis:100%;--col-max-width:100%;}@media(min-width: 62em){.__m__-_R_dmiub_{--col-flex-grow:auto;--col-flex-basis:66.66666666666667%;--col-max-width:66.66666666666667%;}}</style><div class="m_96bdd299 mantine-Grid-col __m__-_R_dmiub_"><div style="margin-bottom:var(--mantine-spacing-xl);padding-inline:var(--mantine-spacing-xl);padding-block:var(--mantine-spacing-lg)" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root" data-with-border="true"><p style="margin-bottom:var(--mantine-spacing-md);font-size:var(--mantine-font-size-h5);font-weight:bold" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">What's included</p><style data-mantine-styles="inline">.__m__-_R_ajddmiub_{--sg-spacing-x:var(--mantine-spacing-xs);--sg-spacing-y:var(--mantine-spacing-xs);--sg-cols:1;}@media(min-width: 48em){.__m__-_R_ajddmiub_{--sg-cols:2;}}</style><div class="m_2415a157 mantine-SimpleGrid-root __m__-_R_ajddmiub_"><div style="align-items:center" class="m_8bffd616 mantine-Flex-root __m__-_R_1mqjddmiub_"><div style="--ti-size:var(--ti-size-xs);--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;margin-inline-end:var(--mantine-spacing-xs);color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent" data-size="xs"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-check "><path d="M5 12l5 5l10 -10"></path></svg></div>11 lessons (video and/or text)</div><div style="align-items:center" class="m_8bffd616 mantine-Flex-root __m__-_R_2mqjddmiub_"><div style="--ti-size:var(--ti-size-xs);--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;margin-inline-end:var(--mantine-spacing-xs);color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent" data-size="xs"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-check "><path d="M5 12l5 5l10 -10"></path></svg></div>10 exercises in the simulator</div><div style="align-items:center" class="m_8bffd616 mantine-Flex-root __m__-_R_3mqjddmiub_"><div style="--ti-size:var(--ti-size-xs);--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;margin-inline-end:var(--mantine-spacing-xs);color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent" data-size="xs"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-check "><path d="M5 12l5 5l10 -10"></path></svg></div>22 verification tests</div><div style="align-items:center" class="m_8bffd616 mantine-Flex-root __m__-_R_4mqjddmiub_"><div style="--ti-size:var(--ti-size-xs);--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;margin-inline-end:var(--mantine-spacing-xs);color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent" data-size="xs"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-check "><path d="M5 12l5 5l10 -10"></path></svg></div>Self-study tasks</div><div style="align-items:center" class="m_8bffd616 mantine-Flex-root __m__-_R_5mqjddmiub_"><div style="--ti-size:var(--ti-size-xs);--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;margin-inline-end:var(--mantine-spacing-xs);color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent" data-size="xs"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-check "><path d="M5 12l5 5l10 -10"></path></svg></div>Extra materials</div><div style="align-items:center" class="m_8bffd616 mantine-Flex-root __m__-_R_6mqjddmiub_"><div style="--ti-size:var(--ti-size-xs);--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;margin-inline-end:var(--mantine-spacing-xs);color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent" data-size="xs"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-plus "><path d="M12 5l0 14"></path><path d="M5 12l14 0"></path></svg></div>11 extended materials</div></div></div><div style="margin-bottom:var(--mantine-spacing-xl)" class=""><h2 style="--title-fw:var(--mantine-h2-font-weight);--title-lh:var(--mantine-h2-line-height);--title-fz:var(--mantine-h2-font-size);margin-bottom:var(--mantine-spacing-md)" class="m_8a5d1357 mantine-Title-root" data-order="2">Description</h2><div class="m_d08caa0 mantine-Typography-root"><p>Regular expressions (Regexp) are a powerful way to process strings, allowing you to find substrings (part of a string) in strings according to complex conditions. They are present in all high-level languages without exception and are often encountered in everyday work. However, you can only use the full power of regular expressions if you understand their language.</p></div></div><div style="margin-bottom:var(--mantine-spacing-xl)" class=""><h2 style="--title-fw:var(--mantine-h2-font-weight);--title-lh:var(--mantine-h2-line-height);--title-fz:var(--mantine-h2-font-size);margin-bottom:var(--mantine-spacing-md)" class="m_8a5d1357 mantine-Title-root" data-order="2">You will learn</h2><ul class="m_abbac491 mantine-List-root" data-type="none"><li style="margin-bottom:var(--mantine-spacing-xs);line-height:var(--mantine-line-height-sm)" class="m_abb6bec2 mantine-List-item" data-with-icon="true" data-centered="true"><div class="m_75cd9f71 mantine-List-itemWrapper"><span class="m_60f83e5b mantine-List-itemIcon"><div style="--ti-size:var(--ti-size-xs);--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent" data-size="xs"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-plus "><path d="M12 5l0 14"></path><path d="M5 12l14 0"></path></svg></div></span><span class="mantine-List-itemLabel">Handle strings efficiently in your language</span></div></li><li style="margin-bottom:var(--mantine-spacing-xs);line-height:var(--mantine-line-height-sm)" class="m_abb6bec2 mantine-List-item" data-with-icon="true" data-centered="true"><div class="m_75cd9f71 mantine-List-itemWrapper"><span class="m_60f83e5b mantine-List-itemIcon"><div style="--ti-size:var(--ti-size-xs);--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent" data-size="xs"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-plus "><path d="M12 5l0 14"></path><path d="M5 12l14 0"></path></svg></div></span><span class="mantine-List-itemLabel">Define complex expressions using character classes, ranges and conditions</span></div></li><li style="margin-bottom:var(--mantine-spacing-xs);line-height:var(--mantine-line-height-sm)" class="m_abb6bec2 mantine-List-item" data-with-icon="true" data-centered="true"><div class="m_75cd9f71 mantine-List-itemWrapper"><span class="m_60f83e5b mantine-List-itemIcon"><div style="--ti-size:var(--ti-size-xs);--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent" data-size="xs"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-plus "><path d="M12 5l0 14"></path><path d="M5 12l14 0"></path></svg></div></span><span class="mantine-List-itemLabel">Control the behavior of regular expressions with flags</span></div></li></ul></div><div style="margin-bottom:var(--mantine-spacing-xl)" class=""><h2 style="--title-fw:var(--mantine-h2-font-weight);--title-lh:var(--mantine-h2-line-height);--title-fz:var(--mantine-h2-font-size);margin-bottom:var(--mantine-spacing-md)" class="m_8a5d1357 mantine-Title-root" data-order="2">Syllabus</h2><table style="--table-vertical-spacing:calc(0.4375rem * var(--mantine-scale))" class="m_b23fa0ef mantine-Table-table"><tbody class="m_b2404537 mantine-Table-tbody"><tr class="m_4e7aa4fd mantine-Table-tr" data-with-row-border="true"><td class="m_4e7aa4ef mantine-Table-td"><p style="font-size:var(--mantine-font-size-h4)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">1</p></td><td style="padding-block:var(--mantine-spacing-lg)" class="m_4e7aa4ef mantine-Table-td"><a style="color:inherit;font-size:var(--mantine-font-size-h5)" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/courses/regexp/lessons/symbols/theory_unit">Character representation. Metacharacter.</a><p style="color:var(--mantine-color-dimmed)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Learn basic regular expressions</p></td></tr><tr class="m_4e7aa4fd mantine-Table-tr" data-with-row-border="true"><td class="m_4e7aa4ef mantine-Table-td"><p style="font-size:var(--mantine-font-size-h4)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">2</p></td><td style="padding-block:var(--mantine-spacing-lg)" class="m_4e7aa4ef mantine-Table-td"><a style="color:inherit;font-size:var(--mantine-font-size-h5)" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/courses/regexp/lessons/character_classes/theory_unit">Character classes</a><p style="color:var(--mantine-color-dimmed)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Learn how to compose and use character groups</p></td></tr><tr class="m_4e7aa4fd mantine-Table-tr" data-with-row-border="true"><td class="m_4e7aa4ef mantine-Table-td"><p style="font-size:var(--mantine-font-size-h4)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">3</p></td><td style="padding-block:var(--mantine-spacing-lg)" class="m_4e7aa4ef mantine-Table-td"><a style="color:inherit;font-size:var(--mantine-font-size-h5)" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/courses/regexp/lessons/anchors/theory_unit">Position within a string</a><p style="color:var(--mantine-color-dimmed)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Learn to set boundaries</p></td></tr><tr class="m_4e7aa4fd mantine-Table-tr" data-with-row-border="true"><td class="m_4e7aa4ef mantine-Table-td"><p style="font-size:var(--mantine-font-size-h4)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">4</p></td><td style="padding-block:var(--mantine-spacing-lg)" class="m_4e7aa4ef mantine-Table-td"><a style="color:inherit;font-size:var(--mantine-font-size-h5)" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/courses/regexp/lessons/alternation/theory_unit">Alternative</a><p style="color:var(--mantine-color-dimmed)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Learn to use an enum</p></td></tr><tr class="m_4e7aa4fd mantine-Table-tr" data-with-row-border="true"><td class="m_4e7aa4ef mantine-Table-td"><p style="font-size:var(--mantine-font-size-h4)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">5</p></td><td style="padding-block:var(--mantine-spacing-lg)" class="m_4e7aa4ef mantine-Table-td"><a style="color:inherit;font-size:var(--mantine-font-size-h5)" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/courses/regexp/lessons/quantifiers/theory_unit">Quantification</a><p style="color:var(--mantine-color-dimmed)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Learn how to set repetitions</p></td></tr><tr class="m_4e7aa4fd mantine-Table-tr" data-with-row-border="true"><td class="m_4e7aa4ef mantine-Table-td"><p style="font-size:var(--mantine-font-size-h4)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">6</p></td><td style="padding-block:var(--mantine-spacing-lg)" class="m_4e7aa4ef mantine-Table-td"><a style="color:inherit;font-size:var(--mantine-font-size-h5)" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/courses/regexp/lessons/greedy/theory_unit">Greediness</a><p style="color:var(--mantine-color-dimmed)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Stop being greedy</p></td></tr><tr class="m_4e7aa4fd mantine-Table-tr" data-with-row-border="true"><td class="m_4e7aa4ef mantine-Table-td"><p style="font-size:var(--mantine-font-size-h4)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">7</p></td><td style="padding-block:var(--mantine-spacing-lg)" class="m_4e7aa4ef mantine-Table-td"><a style="color:inherit;font-size:var(--mantine-font-size-h5)" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/courses/regexp/lessons/backreferences/theory_unit">Grouping. Backreferences</a><p style="color:var(--mantine-color-dimmed)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Learn how to reuse groups in regular expressions</p></td></tr><tr class="m_4e7aa4fd mantine-Table-tr" data-with-row-border="true"><td class="m_4e7aa4ef mantine-Table-td"><p style="font-size:var(--mantine-font-size-h4)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">8</p></td><td style="padding-block:var(--mantine-spacing-lg)" class="m_4e7aa4ef mantine-Table-td"><a style="color:inherit;font-size:var(--mantine-font-size-h5)" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/courses/regexp/lessons/modifiers/theory_unit">Modifiers</a><p style="color:var(--mantine-color-dimmed)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Learn to control via flags inside a regular expression</p></td></tr><tr class="m_4e7aa4fd mantine-Table-tr" data-with-row-border="true"><td class="m_4e7aa4ef mantine-Table-td"><p style="font-size:var(--mantine-font-size-h4)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">9</p></td><td style="padding-block:var(--mantine-spacing-lg)" class="m_4e7aa4ef mantine-Table-td"><a style="color:inherit;font-size:var(--mantine-font-size-h5)" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/courses/regexp/lessons/lookaround/theory_unit">Look forward/backward</a><p style="color:var(--mantine-color-dimmed)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Learn how to exclude viewed matches from groups</p></td></tr><tr class="m_4e7aa4fd mantine-Table-tr" data-with-row-border="true"><td class="m_4e7aa4ef mantine-Table-td"><p style="font-size:var(--mantine-font-size-h4)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">10</p></td><td style="padding-block:var(--mantine-spacing-lg)" class="m_4e7aa4ef mantine-Table-td"><a style="color:inherit;font-size:var(--mantine-font-size-h5)" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/courses/regexp/lessons/regexp_conditionals/theory_unit">Search by condition</a><p style="color:var(--mantine-color-dimmed)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Learn to set conditions</p></td></tr><tr class="m_4e7aa4fd mantine-Table-tr" data-with-row-border="true"><td class="m_4e7aa4ef mantine-Table-td"><p style="font-size:var(--mantine-font-size-h4)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">11</p></td><td style="padding-block:var(--mantine-spacing-lg)" class="m_4e7aa4ef mantine-Table-td"><a style="color:inherit;font-size:var(--mantine-font-size-h5)" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/courses/regexp/lessons/flags/theory_unit">Flags</a><p style="color:var(--mantine-color-dimmed)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Learn the main global flags</p></td></tr></tbody></table></div><div class=""><h2 style="--title-fw:var(--mantine-h2-font-weight);--title-lh:var(--mantine-h2-line-height);--title-fz:var(--mantine-h2-font-size);margin-bottom:var(--mantine-spacing-md)" class="m_8a5d1357 mantine-Title-root" data-order="2">Recommended programs</h2><style data-mantine-styles="inline">.__m__-_R_avddmiub_{--carousel-slide-gap:var(--mantine-spacing-xs);--carousel-slide-size:70%;}@media(min-width: 36em){.__m__-_R_avddmiub_{--carousel-slide-gap:var(--mantine-spacing-xl);--carousel-slide-size:50%;}}</style><div style="--carousel-control-size:calc(2.5rem * var(--mantine-scale));--carousel-controls-offset:var(--mantine-spacing-sm);margin-bottom:var(--mantine-spacing-lg);padding-block:var(--mantine-spacing-sm);background:var(--app-color-surface)" class="m_17884d0f mantine-Carousel-root responsiveClassName" data-orientation="horizontal" 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