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POSlow regex in Python?
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  1. POSlow regex in Python?
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    copied!<p>I'm trying to match these kinds of strings</p> <pre><code>{@csm.foo.bar} </code></pre> <p>without matching any of these</p> <pre><code>{@csm.foo.bar-@csm.ooga.booga} {@csm.foo.bar-42} </code></pre> <p>The regex I use is</p> <pre><code>r"\{@csm.((?:[a-zA-Z0-9_]+\.?)+)\}" </code></pre> <p>It gets dog slow if the string contains multiple matches. Why? It runs very fast if I take away the brace matching, like this</p> <pre><code>r"@csm.((?:[a-zA-Z0-9_]+\.?)+)" </code></pre> <p>but that's not what I want.</p> <p>Any ideas?</p> <p>Here is sample input:</p> <pre><code>&lt;dockLayout id="popup" y="0" x="0" width="{@csm.screenWidth}" height="{@csm.screenHeight}"&gt; &lt;dataNumber id="selopacity_Volt" name="selopacity_Volt" value="0" /&gt; &lt;dataNumber id="selopacity_Amp" name="selopacity_Amp" value="0" /&gt; &lt;animate trigger="{@m_ds_ML.VIMPBM_BatteryVoltage.valstr}" triggerOn="*" targetNode="selopacity_Volt" targetAttr="value" to="1" dur="0ms" ease="in" /&gt; &lt;animate trigger="{@m_ds_ML.VIMPBM_BatteryVoltage.valstr}" triggerOn="65024" targetNode="selopacity_Volt" targetAttr="value" to="0" dur="0ms" ease="in" /&gt; &lt;animate trigger="{@m_ds_ML.VIMPBM_BatteryCurrent.valstr}" triggerOn="*" targetNode="selopacity_Amp" targetAttr="value" to="1" dur="0ms" ease="in" /&gt; &lt;animate trigger="{@m_ds_ML.VIMPBM_BatteryCurrent.valstr}" triggerOn="65024" targetNode="selopacity_Amp" targetAttr="value" to="0" dur="0ms" ease="in" /&gt; &lt;dockLayout id="item" width="{@csm.screenWidth}" height="{@csm.screenHeight}" depth="-1" clip="false" xmlns="http://www.tat.se/kastor/kml" &gt; &lt;dockLayout id="list_item_title" x="0" width="{@csm.screenWidth}" height="{@csm.Gearselection.text_heght-@csm.pageVisualCP_y}"&gt; &lt;text id="volt_amp_text" x="0" ellipsize="false" font="{@csm.listUnselFont}" color="{@csm.itemUnselColor}" dockLayout.halign="left" dockLayout.valign="bottom" string="{ItemTitle}" /&gt; &lt;/dockLayout&gt; &lt;dockLayout id="gear_layout" y="0" x="0" width="{@csm.screenWidth}" height="{@csm.vmImage_y_gearselection-@csm.pageVisualCP_y}"&gt; &lt;image id="battery_image" x="0" dockLayout.halign="left" dockLayout.valign="bottom" opacity="1" src="{@m_MenuModel.Gauges.VoltAmpereMeter.image}"/&gt; &lt;/dockLayout&gt; &lt;!--DockLayout for Voltage Value--&gt; &lt;dockLayout id="volt_value" x="0" width="{@csm.VoltAmpereMeter.volt_value_x-@csm.VoltAmpereMeter.List_x}" height="{@csm.vmImage_y_gearselection-@csm.pageVisualCP_y}"&gt; &lt;text id="volt_value_text" x="0" opacity="{selopacity_Volt*selopacity_Amp}" ellipsize="false" font="{@csm.listUnselFont}" color="{@csm.itemSelColor}" dockLayout.halign="right" dockLayout.valign="bottom" string="{@m_ds_ML.VIMPBM_BatteryVoltage.valstr}" &gt; &lt;/text&gt; &lt;/dockLayout&gt; &lt;!--DockLayout for Voltage Unit--&gt; &lt;dockLayout id="volt_unit" x="{@csm.VoltAmpereMeter.volt_unit_x-@csm.VoltAmpereMeter.List_x}" width="{@csm.screenWidth}" height="{@csm.vmImage_y_gearselection-@csm.pageVisualCP_y}"&gt; &lt;text id="volt_unit_text" x="0" opacity="{selopacity_Volt*selopacity_Amp}" ellipsize="false" font="{@csm.listUnselFont}" color="{@csm.itemSelColor}" dockLayout.halign="left" dockLayout.valign="bottom" string="V" &gt; &lt;/text&gt; &lt;/dockLayout&gt; &lt;!--DockLayout for Ampere Value--&gt; &lt;dockLayout id="ampere_value" x="0" width="{@csm.VoltAmpereMeter.ampere_value_x-@csm.VoltAmpereMeter.List_x}" height="{@csm.vmImage_y_gearselection-@csm.pageVisualCP_y}"&gt; &lt;text id="ampere_value_text" x="0" opacity="{selopacity_Amp*selopacity_Volt}" ellipsize="false" font="{@csm.listUnselFont}" color="{@csm.itemSelColor}" dockLayout.halign="right" dockLayout.valign="bottom" string="{@m_ds_ML.VIMPBM_BatteryCurrent.valstr}" &gt; &lt;/text&gt; &lt;/dockLayout&gt; &lt;!--DockLayout for Ampere Unit--&gt; &lt;dockLayout id="ampere_unit" x="{@csm.VoltAmpereMeter.ampere_unit_x-@csm.VoltAmpereMeter.List_x}" width="{@csm.screenWidth}" height="{@csm.vmImage_y_gearselection-@csm.pageVisualCP_y}"&gt; &lt;text id="ampere_unit_text" x="0" opacity="{selopacity_Amp*selopacity_Volt}" ellipsize="false" font="{@csm.listUnselFont}" color="{@csm.itemSelColor}" dockLayout.halign="left" dockLayout.valign="bottom" string="A" &gt; &lt;/text&gt; &lt;/dockLayout&gt; &lt;!--DockLayout for containing Data Not Available text--&gt; &lt;dockLayout id="no_data_textline" x="{@csm.VoltAmpereMeter.List_x1-@csm.VoltAmpereMeter.List_x}" width="{@csm.screenWidth}" height="{@csm.vmImage_y_gearselection-@csm.pageVisualCP_y}"&gt; &lt;text id="no_data_text" x="0" opacity="{1-(selopacity_Amp*selopacity_Volt)}" ellipsize="false" font="{@csm.listSelFont}" color="{@csm.itemSelColor}" dockLayout.halign="left" dockLayout.valign="bottom" string="{text1}" &gt; &lt;/text&gt; &lt;/dockLayout&gt; &lt;!--&lt;rect id="test_rect1" x="{151-28}" y="0" width="1" height="240" opacity="1" fill="#00ff00" /&gt; &lt;rect id="test_rect1" x="{237-28}" y="0" width="1" height="240" opacity="1" fill="#00ff00" /&gt; &lt;rect id="test_rect1" x="{160-28}" y="0" width="1" height="240" opacity="1" fill="#00ff00" /&gt; &lt;rect id="test_rect1" x="{246-28}" y="0" width="1" height="240" opacity="1" fill="#00ff00" /&gt; &lt;rect id="test_rect8" x="0" y="{161-40}" width="320" height="1" opacity="1" fill="#00ff00" /&gt; &lt;rect id="test_rect1" x="{109-28}" y="0" width="1" height="240" opacity="1" fill="#00ff00" /&gt;--&gt; &lt;/dockLayout&gt; &lt;/dockLayout&gt; </code></pre>
 

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