regexrule.html

用JAVA编写的,在做实验的时候留下来的,本来想删的,但是传上来,大家分享吧

<a name="83" href="#83">83</a>              format(matcher, format, buffer);
<a name="84" href="#84">84</a>              retVal = buffer.toString();
<a name="85" href="#85">85</a>          }
<a name="86" href="#86">86</a>          TextUtils.recycleMatcher(matcher);
<a name="87" href="#87">87</a>          <strong>return</strong> retVal;
<a name="88" href="#88">88</a>      }
<a name="89" href="#89">89</a>      
<a name="90" href="#90">90</a>      <em>/**<em>*</em></em>
<a name="91" href="#91">91</a>  <em>     * @param matcher Matched matcher.</em>
<a name="92" href="#92">92</a>  <em>     * @param format Output format specifier.</em>
<a name="93" href="#93">93</a>  <em>     * @param buffer Buffer to append output to.</em>
<a name="94" href="#94">94</a>  <em>     */</em>
<a name="95" href="#95">95</a>      <strong>protected</strong> <strong>void</strong> format(Matcher matcher, String format,
<a name="96" href="#96">96</a>              StringBuffer buffer) {
<a name="97" href="#97">97</a>          <strong>for</strong> (<strong>int</strong> i = 0; i &lt; <strong>for</strong>mat.length(); i++) {
<a name="98" href="#98">98</a>              <strong>switch</strong>(format.charAt(i)) {
<a name="99" href="#99">99</a>                  <strong>case</strong> '&#47;&#47;':
<a name="100" href="#100">100</a>                     <strong>if</strong> ((i + 1) &lt; format.length() &amp;&amp;
<a name="101" href="#101">101</a>                             format.charAt(i + 1) == '$') {
<a name="102" href="#102">102</a>                         <em class="comment">// Don't write the escape character in output.</em>
<a name="103" href="#103">103</a>                         <strong>continue</strong>;
<a name="104" href="#104">104</a>                     }
<a name="105" href="#105">105</a>                     
<a name="106" href="#106">106</a>                 <strong>case</strong> '$':
<a name="107" href="#107">107</a>                     <em class="comment">// Check to see if its not been escaped.</em>
<a name="108" href="#108">108</a>                     <strong>if</strong> (i == 0 || (i > 0 &amp;&amp; (format.charAt(i - 1) != '&#47;&#47;'))) {
<a name="109" href="#109">109</a>                         <em class="comment">// Looks like we have a matching group specifier in</em>
<a name="110" href="#110">110</a>                         <em class="comment">// our format string, something like '$2' or '${2}'.</em>
<a name="111" href="#111">111</a>                         <strong>int</strong> start = i + 1;
<a name="112" href="#112">112</a>                         <strong>boolean</strong> curlyBraceStart = false;
<a name="113" href="#113">113</a>                         <strong>if</strong> (format.charAt(start) == '{') {
<a name="114" href="#114">114</a>                             start++;
<a name="115" href="#115">115</a>                             curlyBraceStart = <strong>true</strong>;
<a name="116" href="#116">116</a>                         }
<a name="117" href="#117">117</a>                         <strong>int</strong> j = start;
<a name="118" href="#118">118</a>                         <strong>for</strong> (; j &lt; <strong>for</strong>mat.length() &amp;&amp;
<a name="119" href="#119">119</a>                                 Character.isDigit(format.charAt(j)); j++) {
<a name="120" href="#120">120</a>                             <em class="comment">// While a digit, increment.</em>
<a name="121" href="#121">121</a>                         }
<a name="122" href="#122">122</a>                         <strong>if</strong> (j > start) {
<a name="123" href="#123">123</a>                             <strong>int</strong> groupIndex = Integer.
<a name="124" href="#124">124</a>                                 parseInt(format.substring(start, j));
<a name="125" href="#125">125</a>                             <strong>if</strong> (groupIndex >= 0 &amp;&amp; groupIndex &lt; 256) {
<a name="126" href="#126">126</a>                                 String g = <strong>null</strong>;
<a name="127" href="#127">127</a>                                 <strong>try</strong> {
<a name="128" href="#128">128</a>                                     g = matcher.group(groupIndex);
<a name="129" href="#129">129</a>                                 } <strong>catch</strong> (IndexOutOfBoundsException e) {
<a name="130" href="#130">130</a>                                     logger.warning(<span class="string">"IndexOutOfBoundsException"</span> +
<a name="131" href="#131">131</a>                                         <span class="string">" getting group "</span> + groupIndex +
<a name="132" href="#132">132</a>                                         <span class="string">" from "</span> + matcher.group(0) +
<a name="133" href="#133">133</a>                                         <span class="string">" with format of "</span> + format);
<a name="134" href="#134">134</a>                                 }
<a name="135" href="#135">135</a>                                 <strong>if</strong> (g != <strong>null</strong>) {
<a name="136" href="#136">136</a>                                     buffer.append(g);
<a name="137" href="#137">137</a>                                 }
<a name="138" href="#138">138</a>                                 <em class="comment">// Skip closing curly bracket if one.</em>
<a name="139" href="#139">139</a>                                 <strong>if</strong> (curlyBraceStart &amp;&amp;
<a name="140" href="#140">140</a>                                         format.charAt(j) == '}') {
<a name="141" href="#141">141</a>                                     j++;
<a name="142" href="#142">142</a>                                 }
<a name="143" href="#143">143</a>                                 <em class="comment">// Update the loop index so that we skip over</em>
<a name="144" href="#144">144</a>                                 <em class="comment">// the ${x} group item.</em>
<a name="145" href="#145">145</a>                                 i = (j - 1);
<a name="146" href="#146">146</a>                                 <em class="comment">// Don't fall through to the default.</em>
<a name="147" href="#147">147</a>                                 <strong>continue</strong>;
<a name="148" href="#148">148</a>                             }
<a name="149" href="#149">149</a>                         }
<a name="150" href="#150">150</a>                         
<a name="151" href="#151">151</a>                     }
<a name="152" href="#152">152</a>                     <em class="comment">// Let fall through to default rule.  The '$' was escaped.</em>
<a name="153" href="#153">153</a>                     
<a name="154" href="#154">154</a>                 <strong>default</strong>:
<a name="155" href="#155">155</a>                     buffer.append(format.charAt(i));
<a name="156" href="#156">156</a>             }
<a name="157" href="#157">157</a>         }
<a name="158" href="#158">158</a>     }
<a name="159" href="#159">159</a> 
<a name="160" href="#160">160</a>     <strong>protected</strong> String getNullOrAttribute(String name, Object context) {
<a name="161" href="#161">161</a>         <strong>try</strong> {
<a name="162" href="#162">162</a>             <strong>return</strong> (String)getAttribute(context, name);
<a name="163" href="#163">163</a>         } <strong>catch</strong> (Exception e) {
<a name="164" href="#164">164</a>             logger.severe(e.getMessage());
<a name="165" href="#165">165</a>             <strong>return</strong> <strong>null</strong>;
<a name="166" href="#166">166</a>         }
<a name="167" href="#167">167</a>     }
<a name="168" href="#168">168</a> }
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