How to use sed to find and replace string in mac terminal? - bash

Question

I use Xcode. I want to use bash to batch modify the UI fonts.
For instance change:
<fontDescription key="fontDescription" type="system" pointSize="17"/>
to:
<fontDescription key="fontDescription" name="PingFangSC-Regular" family="PingFang SC" pointSize="12"/>`
Code to start:
find . -type f '(' -name '*.storyboard' -o -name '*.xib' ')' . \
-exec sed -i '' s/'\<fontDescription key=\"fontDescription\" type=\"system\" pointSize=\"17\"\/\>'/'\<fontDescription key=\"fontDescription\" name=\"PingFangSC-Regular\" family=\"PingFang SC\" pointSize=\"12\"\/\>'/ {} +
# placeholder, to look code better
This is the easy version. I want to find the number ( font size ) and replaced in the next string.
I have read Using sed to find and replace complex string (preferrably with regex) .
Thanks to #battlmonstr, I tried
find . -type f '(' -name '*.storyboard' -o -name '*.xib' ')' \
-exec sed -E -i '' 's#\<fontDescription key=\"fontDescription\" type=\"system\" pointSize=\"17\"/>#<fontDescription key=\"fontDescription\" name=\"PingFangSC-Regular\" family=\"PingFang SC\" pointSize=\"12\"\/>#' {} +
# placeholder
It is OK.
In order to test more , like
$ echo abcd123 | sed 's/\([a-z]*\).*/\1/'
abcd
I want to keep the number.
In order to get the number ,and then arrange the content to replace, I tried
$ echo "<fontDescription key="fontDescription" type="system" pointSize="17"/>" | \
sed -E 's#\<fontDescription key=\"fontDescription\" type=\"system\" pointSize=\"(\d+)\"\/>#\1#'
<fontDescription key=fontDescription type=system pointSize=17/>
The result is not OK, not like the one above. Not expected.
I tested in regex101 which is OK. I'm still figuring why.
The example content:
<?xml version="1.0" encoding="UTF-8"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14460.31" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
<device id="retina4_7" orientation="portrait">
<adaptation id="fullscreen"/>
</device>
<dependencies>
<deployment identifier="iOS"/>
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14460.20"/>
<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
</dependencies>
<scenes>
<!--View Controller-->
<scene sceneID="tne-QT-ifu">
<objects>
<viewController id="BYZ-38-t0r" customClass="ViewController" sceneMemberID="viewController">
<layoutGuides>
<viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
<viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
</layoutGuides>
<view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
<rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<subviews>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Label" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="7yI-IF-sfh">
<rect key="frame" x="126" y="266" width="42" height="21"/>
<autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
<fontDescription key="fontDescription" name="PingFangSC-Regular" family="PingFang SC" pointSize="12"/>
<nil key="textColor"/>
<nil key="highlightedColor"/>
</label>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Label" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="vTz-nw-d8Y">
<rect key="frame" x="126" y="416" width="42" height="21"/>
<autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
<fontDescription key="fontDescription" name="PingFangSC-Regular" family="PingFang SC" pointSize="12"/>
<nil key="textColor"/>
<nil key="highlightedColor"/>
</label>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Label" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="VCU-bo-Iyu">
<rect key="frame" x="175" y="218" width="42" height="21"/>
<autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
<fontDescription key="fontDescription" name="PingFangSC-Regular" family="PingFang SC" pointSize="12"/>
<nil key="textColor"/>
<nil key="highlightedColor"/>
</label>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Label" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="O3R-uM-fzi">
<rect key="frame" x="91" y="217" width="42" height="21"/>
<autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
<fontDescription key="fontDescription" name="PingFangSC-Regular" family="PingFang SC" pointSize="12"/>
<nil key="textColor"/>
<nil key="highlightedColor"/>
</label>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Label" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="93Z-nX-mmW">
<rect key="frame" x="188" y="64" width="42" height="21"/>
<autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
<fontDescription key="fontDescription" name="PingFangSC-Regular" family="PingFang SC" pointSize="12"/>
<nil key="textColor"/>
<nil key="highlightedColor"/>
</label>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Label" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="9O2-dY-2nt">
<rect key="frame" x="277" y="197" width="42" height="13"/>
<autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
<fontDescription key="fontDescription" name="PingFangSC-Regular" family="PingFang SC" pointSize="12"/>
<nil key="textColor"/>
<nil key="highlightedColor"/>
</label>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Label" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="7Mp-RI-aG9">
<rect key="frame" x="69" y="87" width="42" height="21"/>
<autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
<fontDescription key="fontDescription" name="PingFangSC-Regular" family="PingFang SC" pointSize="12"/>
<nil key="textColor"/>
<nil key="highlightedColor"/>
</label>
</subviews>
<color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
<gestureRecognizers/>
<connections>
<outletCollection property="gestureRecognizers" destination="QsQ-yU-xmv" appends="YES" id="4co-bU-mXm"/>
</connections>
</view>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
<pongPressGestureRecognizer allowableMovement="10" minimumPressDuration="0.5" id="QsQ-yU-xmv"/>
</objects>
<point key="canvasLocation" x="53.600000000000001" y="26.53673163418291"/>
</scene>
</scenes>
</document>

Answer 1

Between the first and 2nd version you have replaced -i '' with -E '' which is likely causing this problem. You probably want to keep -i, and add -E before that like this:
sed -E -i '' ...
'' is an argument to -i that basically tells "do not do backups".
What usually helps to find the problem is to debug "sed" separately from "find", e.g. run that sed command separately, without find and without in-place replacement, and hack until it works. Then add -i and find on top.
I recommend to start simple and work your way forward.
Simplify to this:
sed -E 's/pointSize="12"/pointSize="15"/'
Test that it works. Then improve it a bit:
sed -E 's/pointSize="[0-9]+"/pointSize="15"/'
Test that it works, etc.

Answer 2

The actual code based on battlmonstr's answer.
find . -type f '(' -name '*.storyboard' -o -name '*.xib' ')' -exec \
sed -E -i '' 's#\<fontDescription key=\"fontDescription\" type=\"system\" pointSize=\"([0-9]+)\"/>#<fontDescription key=\"fontDescription\" name=\"PingFangSC-Regular\" family=\"PingFang SC\" pointSize=\"\1\"\/>#' {} +
#
Firstly I try like this echo "pointSize=\"11\"" | sed -E 's#\pointSize=\"([0-9]+)\"#poinize=\"\1\"#'