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regular-expressions
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Go by Example မြန်မာဘာသာ: Regular Expressions</title>
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<div class="example" id="regular-expressions">
<h2><a href="./">Go by Example မြန်မာဘာသာ</a>: Regular Expressions</h2>
<table>
<tr>
<td class="docs">
<p>Go က <a href="https://en.wikipedia.org/wiki/Regular_expression">regular expressions</a> အတွက် built-in ထောက်ပံ့မှုပေးထားပါတယ်။
ဒီမှာ Go မှာ အသုံးများတဲ့ regexp-related လုပ်ငန်းတွေရဲ့ ဥပမာတချို့ ရှိပါတယ်။</p>
</td>
<td class="code leading">
<a href="https://go.dev/play/p/b_kShRHnIsi"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
<pre class="chroma">
<span class="kn">package</span> <span class="nx">main</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="kn">import</span> <span class="p">(</span>
<span class="s">"bytes"</span>
<span class="s">"fmt"</span>
<span class="s">"regexp"</span>
<span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ဒါက pattern တစ်ခုက string တစ်ခုနဲ့ ကိုက်ညီမှု ရှိမရှိ စမ်းသပ်ပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma"><span class="kd">func</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"> <span class="nx">match</span><span class="p">,</span> <span class="nx">_</span> <span class="o">:=</span> <span class="nx">regexp</span><span class="p">.</span><span class="nf">MatchString</span><span class="p">(</span><span class="s">"p([a-z]+)ch"</span><span class="p">,</span> <span class="s">"peach"</span><span class="p">)</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">match</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>အပေါ်မှာ ကျွန်တော်တို့က string pattern ကို တိုက်ရိုက်သုံးခဲ့ပါတယ်၊ ဒါပေမယ့်
တခြား regexp လုပ်ငန်းတွေအတွက် သင့်အနေနဲ့ optimize လုပ်ထားတဲ့ <code>Regexp</code> struct တစ်ခုကို
<code>Compile</code> လုပ်ဖို့ လိုအပ်ပါလိမ့်မယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">r</span><span class="p">,</span> <span class="nx">_</span> <span class="o">:=</span> <span class="nx">regexp</span><span class="p">.</span><span class="nf">Compile</span><span class="p">(</span><span class="s">"p([a-z]+)ch"</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ဒီ struct တွေမှာ method အများကြီး ရနိုင်ပါတယ်။ ဒါက
အရင်က ကျွန်တော်တို့ မြင်ခဲ့တဲ့လိုမျိုး match test တစ်ခုပါ။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">r</span><span class="p">.</span><span class="nf">MatchString</span><span class="p">(</span><span class="s">"peach"</span><span class="p">))</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ဒါက regexp နဲ့ကိုက်ညီတာကို ရှာဖွေပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">r</span><span class="p">.</span><span class="nf">FindString</span><span class="p">(</span><span class="s">"peach punch"</span><span class="p">))</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ဒါကလည်း ပထမဆုံး ကိုက်ညီတာကို ရှာပါတယ်၊ ဒါပေမယ့် ကိုက်ညီတဲ့
စာသားအစား ကိုက်ညီတဲ့နေရာရဲ့ အစနဲ့အဆုံး index တွေကို ပြန်ပေးပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">"idx:"</span><span class="p">,</span> <span class="nx">r</span><span class="p">.</span><span class="nf">FindStringIndex</span><span class="p">(</span><span class="s">"peach punch"</span><span class="p">))</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p><code>Submatch</code> မျိုးကွဲတွေက pattern တစ်ခုလုံးနဲ့ကိုက်ညီမှုအကြောင်း သတင်းအချက်အလက်ရော
အဲဒီကိုက်ညီမှုထဲက submatch တွေအကြောင်း သတင်းအချက်အလက်ပါ ထည့်သွင်းပါတယ်။
ဥပမာ ဒါက <code>p([a-z]+)ch</code> နဲ့ <code>([a-z]+)</code> နှစ်ခုလုံးအတွက် သတင်းအချက်အလက် ပြန်ပေးပါလိမ့်မယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">r</span><span class="p">.</span><span class="nf">FindStringSubmatch</span><span class="p">(</span><span class="s">"peach punch"</span><span class="p">))</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ဒီနည်းတူပဲ ဒါက ကိုက်ညီမှုတွေနဲ့ submatch တွေရဲ့ index တွေအကြောင်း သတင်းအချက်အလက် ပြန်ပေးပါလိမ့်မယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">r</span><span class="p">.</span><span class="nf">FindStringSubmatchIndex</span><span class="p">(</span><span class="s">"peach punch"</span><span class="p">))</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ဒီ function တွေရဲ့ <code>All</code> မျိုးကွဲတွေက ပထမတစ်ခုတည်းမဟုတ်ဘဲ
input ထဲက ကိုက်ညီမှုအားလုံးကို အကျုံးဝင်ပါတယ်။ ဥပမာ
regexp နဲ့ကိုက်ညီတာအားလုံးကို ရှာဖို့ပါ။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">r</span><span class="p">.</span><span class="nf">FindAllString</span><span class="p">(</span><span class="s">"peach punch pinch"</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">))</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ဒီ <code>All</code> မျိုးကွဲတွေက အပေါ်မှာ ကျွန်တော်တို့ မြင်ခဲ့တဲ့
တခြား function တွေအတွက်လည်း ရနိုင်ပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">"all:"</span><span class="p">,</span> <span class="nx">r</span><span class="p">.</span><span class="nf">FindAllStringSubmatchIndex</span><span class="p">(</span>
<span class="s">"peach punch pinch"</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">))</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ဒီ function တွေရဲ့ ဒုတိယ argument အနေနဲ့ အပေါင်းကိန်း integer တစ်ခု ပေးခြင်းအားဖြင့်
ကိုက်ညီမှုအရေအတွက်ကို ကန့်သတ်နိုင်ပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">r</span><span class="p">.</span><span class="nf">FindAllString</span><span class="p">(</span><span class="s">"peach punch pinch"</span><span class="p">,</span> <span class="mi">2</span><span class="p">))</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>အပေါ်က ဥပမာတွေမှာ ကျွန်တော်တို့က string argument တွေ သုံးခဲ့ပြီး
<code>MatchString</code> လိုမျိုး နာမည်တွေ သုံးခဲ့ပါတယ်။ ကျွန်တော်တို့က
<code>[]byte</code> argument တွေကိုလည်း ပေးနိုင်ပြီး function နာမည်ကနေ <code>String</code> ကို ဖြုတ်နိုင်ပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">r</span><span class="p">.</span><span class="nf">Match</span><span class="p">([]</span><span class="nb">byte</span><span class="p">(</span><span class="s">"peach"</span><span class="p">)))</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>Regular expression တွေနဲ့ global variable တွေ ဖန်တီးတဲ့အခါ
<code>Compile</code> ရဲ့ မျိုးကွဲဖြစ်တဲ့ <code>MustCompile</code> ကို သုံးနိုင်ပါတယ်။
<code>MustCompile</code> က error ပြန်မပေးဘဲ panic ဖြစ်စေပါတယ်၊ ဒါက global variable တွေအတွက်
ပိုပြီး လုံခြုံစိတ်ချရစေပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">r</span> <span class="p">=</span> <span class="nx">regexp</span><span class="p">.</span><span class="nf">MustCompile</span><span class="p">(</span><span class="s">"p([a-z]+)ch"</span><span class="p">)</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">"regexp:"</span><span class="p">,</span> <span class="nx">r</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p><code>regexp</code> package ကို string တစ်ခုရဲ့ တစ်စိတ်တစ်ပိုင်းကို
တခြားတန်ဖိုးတွေနဲ့ အစားထိုးဖို့လည်း သုံးနိုင်ပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">r</span><span class="p">.</span><span class="nf">ReplaceAllString</span><span class="p">(</span><span class="s">"a peach"</span><span class="p">,</span> <span class="s">"<fruit>"</span><span class="p">))</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p><code>Func</code> မျိုးကွဲက ကိုက်ညီတဲ့စာသားကို ပေးထားတဲ့ function တစ်ခုနဲ့
ပြောင်းလဲခွင့်ပေးပါတယ်။</p>
</td>
<td class="code">
<pre class="chroma">
<span class="nx">in</span> <span class="o">:=</span> <span class="p">[]</span><span class="nb">byte</span><span class="p">(</span><span class="s">"a peach"</span><span class="p">)</span>
<span class="nx">out</span> <span class="o">:=</span> <span class="nx">r</span><span class="p">.</span><span class="nf">ReplaceAllFunc</span><span class="p">(</span><span class="nx">in</span><span class="p">,</span> <span class="nx">bytes</span><span class="p">.</span><span class="nx">ToUpper</span><span class="p">)</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nb">string</span><span class="p">(</span><span class="nx">out</span><span class="p">))</span>
<span class="p">}</span>
</pre>
</td>
</tr>
</table>
<table>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="gp">$</span> go run regular-expressions.go
<span class="go">true
</span><span class="go">true
</span><span class="go">peach
</span><span class="go">idx: [0 5]
</span><span class="go">[peach ea]
</span><span class="go">[0 5 1 3]
</span><span class="go">[peach punch pinch]
</span><span class="go">all: [[0 5 1 3] [6 11 7 9] [12 17 13 15]]
</span><span class="go">[peach punch]
</span><span class="go">true
</span><span class="go">regexp: p([a-z]+)ch
</span><span class="go">a <fruit>
</span><span class="go">a PEACH</span></pre>
</td>
</tr>
<tr>
<td class="docs">
<p>For a complete reference on Go regular expressions check
the <a href="https://pkg.go.dev/regexp"><code>regexp</code></a> package docs.</p>
</td>
<td class="code empty">
</td>
</tr>
</table>
<p class="next">
နောက်ဥပမာ: <a href="json">JSON</a>.
</p>
<p class="footer">
by <a href="https://markmcgranaghan.com">Mark McGranaghan</a> နှင့် <a href="https://eli.thegreenplace.net">Eli Bendersky</a> | <a href="https://github.com/mmcgrana/gobyexample">source</a> | <a href="https://github.com/mmcgrana/gobyexample#license">license</a>
</p>
</div>
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